diff --git a/server/src/main/java/cn/keking/service/cache/impl/CacheServiceJDKImpl.java b/server/src/main/java/cn/keking/service/cache/impl/CacheServiceJDKImpl.java
index 04ffefe9..f3430cae 100644
--- a/server/src/main/java/cn/keking/service/cache/impl/CacheServiceJDKImpl.java
+++ b/server/src/main/java/cn/keking/service/cache/impl/CacheServiceJDKImpl.java
@@ -101,6 +101,7 @@ public class CacheServiceJDKImpl implements CacheService {
         initPDFCachePool(CacheService.DEFAULT_PDF_CAPACITY);
         initIMGCachePool(CacheService.DEFAULT_IMG_CAPACITY);
         initPdfImagesCachePool(CacheService.DEFAULT_PDFIMG_CAPACITY);
+        initMediaConvertCachePool(CacheService.DEFAULT_MEDIACONVERT_CAPACITY);
     }
 
     @Override
diff --git a/server/src/main/java/cn/keking/service/cache/impl/CacheServiceRedisImpl.java b/server/src/main/java/cn/keking/service/cache/impl/CacheServiceRedisImpl.java
index 0472a257..b7cb971a 100644
--- a/server/src/main/java/cn/keking/service/cache/impl/CacheServiceRedisImpl.java
+++ b/server/src/main/java/cn/keking/service/cache/impl/CacheServiceRedisImpl.java
@@ -107,6 +107,7 @@ public class CacheServiceRedisImpl implements CacheService {
         cleanPdfCache();
         cleanImgCache();
         cleanPdfImgCache();
+        cleanMediaConvertCache();
     }
 
     @Override
@@ -135,4 +136,9 @@ public class CacheServiceRedisImpl implements CacheService {
         RMapCache<String, Integer> pdfImg = redissonClient.getMapCache(FILE_PREVIEW_PDF_IMGS_KEY);
         pdfImg.clear();
     }
+
+    private void cleanMediaConvertCache() {
+        RMapCache<String, Integer> mediaConvertCache = redissonClient.getMapCache(FILE_PREVIEW_MEDIA_CONVERT_KEY);
+        mediaConvertCache.clear();
+    }
 }
diff --git a/server/src/main/java/cn/keking/service/cache/impl/CacheServiceRocksDBImpl.java b/server/src/main/java/cn/keking/service/cache/impl/CacheServiceRocksDBImpl.java
index b038a52a..c10f997c 100644
--- a/server/src/main/java/cn/keking/service/cache/impl/CacheServiceRocksDBImpl.java
+++ b/server/src/main/java/cn/keking/service/cache/impl/CacheServiceRocksDBImpl.java
@@ -104,7 +104,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
     @SuppressWarnings("unchecked")
     public Map<String, String> getPDFCache() {
         Map<String, String> result = new HashMap<>();
-        try{
+        try {
             result = (Map<String, String>) toObject(db.get(FILE_PREVIEW_PDF_KEY.getBytes()));
         } catch (RocksDBException | IOException | ClassNotFoundException e) {
             LOGGER.error("Get from RocksDB Exception" + e);
@@ -116,7 +116,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
     @SuppressWarnings("unchecked")
     public String getPDFCache(String key) {
         String result = "";
-        try{
+        try {
             Map<String, String> map = (Map<String, String>) toObject(db.get(FILE_PREVIEW_PDF_KEY.getBytes()));
             result = map.get(key);
         } catch (RocksDBException | IOException | ClassNotFoundException e) {
@@ -129,7 +129,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
     @SuppressWarnings("unchecked")
     public Map<String, List<String>> getImgCache() {
         Map<String, List<String>> result = new HashMap<>();
-        try{
+        try {
             result = (Map<String, List<String>>) toObject(db.get(FILE_PREVIEW_IMGS_KEY.getBytes()));
         } catch (RocksDBException | IOException | ClassNotFoundException e) {
             LOGGER.error("Get from RocksDB Exception" + e);
@@ -142,7 +142,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
     public List<String> getImgCache(String key) {
         List<String> result = new ArrayList<>();
         Map<String, List<String>> map;
-        try{
+        try {
             map = (Map<String, List<String>>) toObject(db.get(FILE_PREVIEW_IMGS_KEY.getBytes()));
             result = map.get(key);
         } catch (RocksDBException | IOException | ClassNotFoundException e) {
@@ -156,7 +156,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
     public Integer getPdfImageCache(String key) {
         Integer result = 0;
         Map<String, Integer> map;
-        try{
+        try {
             map = (Map<String, Integer>) toObject(db.get(FILE_PREVIEW_PDF_IMGS_KEY.getBytes()));
             result = map.get(key);
         } catch (RocksDBException | IOException | ClassNotFoundException e) {
@@ -180,7 +180,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
     @SuppressWarnings("unchecked")
     public Map<String, String> getMediaConvertCache() {
         Map<String, String> result = new HashMap<>();
-        try{
+        try {
             result = (Map<String, String>) toObject(db.get(FILE_PREVIEW_MEDIA_CONVERT_KEY.getBytes()));
         } catch (RocksDBException | IOException | ClassNotFoundException e) {
             LOGGER.error("Get from RocksDB Exception" + e);
@@ -203,7 +203,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
     @SuppressWarnings("unchecked")
     public String getMediaConvertCache(String key) {
         String result = "";
-        try{
+        try {
             Map<String, String> map = (Map<String, String>) toObject(db.get(FILE_PREVIEW_MEDIA_CONVERT_KEY.getBytes()));
             result = map.get(key);
         } catch (RocksDBException | IOException | ClassNotFoundException e) {
@@ -218,6 +218,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
             cleanPdfCache();
             cleanImgCache();
             cleanPdfImgCache();
+            cleanMediaConvertCache();
         } catch (IOException | RocksDBException e) {
             LOGGER.error("Clean Cache Exception" + e);
         }
@@ -236,7 +237,7 @@ public class CacheServiceRocksDBImpl implements CacheService {
     @SuppressWarnings("unchecked")
     private Map<String, Integer> getPdfImageCaches() {
         Map<String, Integer> map = new HashMap<>();
-        try{
+        try {
             map = (Map<String, Integer>) toObject(db.get(FILE_PREVIEW_PDF_IMGS_KEY.getBytes()));
         } catch (RocksDBException | IOException | ClassNotFoundException e) {
             LOGGER.error("Get from RocksDB Exception" + e);
@@ -245,22 +246,22 @@ public class CacheServiceRocksDBImpl implements CacheService {
     }
 
 
-    private byte[] toByteArray (Object obj) throws IOException {
+    private byte[] toByteArray(Object obj) throws IOException {
         byte[] bytes;
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         ObjectOutputStream oos = new ObjectOutputStream(bos);
         oos.writeObject(obj);
         oos.flush();
-        bytes = bos.toByteArray ();
+        bytes = bos.toByteArray();
         oos.close();
         bos.close();
         return bytes;
     }
 
-    private Object toObject (byte[] bytes) throws IOException, ClassNotFoundException {
+    private Object toObject(byte[] bytes) throws IOException, ClassNotFoundException {
         Object obj;
-        ByteArrayInputStream bis = new ByteArrayInputStream (bytes);
-        ObjectInputStream ois = new ObjectInputStream (bis);
+        ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
+        ObjectInputStream ois = new ObjectInputStream(bis);
         obj = ois.readObject();
         ois.close();
         bis.close();
@@ -281,4 +282,9 @@ public class CacheServiceRocksDBImpl implements CacheService {
         Map<String, Integer> initPDFIMGCache = new HashMap<>();
         db.put(FILE_PREVIEW_PDF_IMGS_KEY.getBytes(), toByteArray(initPDFIMGCache));
     }
+
+    private void cleanMediaConvertCache() throws IOException, RocksDBException {
+        Map<String, String> initMediaConvertCache = new HashMap<>();
+        db.put(FILE_PREVIEW_MEDIA_CONVERT_KEY.getBytes(), toByteArray(initMediaConvertCache));
+    }
 }