diff --git a/eladmin-system/src/main/java/me/zhengjie/modules/security/rest/AuthController.java b/eladmin-system/src/main/java/me/zhengjie/modules/security/rest/AuthController.java
index 85a488a8..34c05e5b 100644
--- a/eladmin-system/src/main/java/me/zhengjie/modules/security/rest/AuthController.java
+++ b/eladmin-system/src/main/java/me/zhengjie/modules/security/rest/AuthController.java
@@ -48,6 +48,8 @@ public class AuthController {
     private Long expiration;
     @Value("${rsa.private_key}")
     private String privateKey;
+    @Value("${single.login:true}")
+    private Boolean singleLogin;
     private final SecurityProperties properties;
     private final RedisUtils redisUtils;
     private final UserDetailsService userDetailsService;
@@ -97,6 +99,10 @@ public class AuthController {
             put("token", properties.getTokenStartWith() + token);
             put("user", jwtUser);
         }};
+        if(singleLogin){
+            //踢掉之前已经登录的token
+            onlineUserService.checkLoginOnUser(authUser.getUsername(),token);
+        }
         return ResponseEntity.ok(authInfo);
     }
 
diff --git a/eladmin-system/src/main/java/me/zhengjie/modules/security/service/OnlineUserService.java b/eladmin-system/src/main/java/me/zhengjie/modules/security/service/OnlineUserService.java
index 8957e41a..21d2bcab 100644
--- a/eladmin-system/src/main/java/me/zhengjie/modules/security/service/OnlineUserService.java
+++ b/eladmin-system/src/main/java/me/zhengjie/modules/security/service/OnlineUserService.java
@@ -1,5 +1,6 @@
 package me.zhengjie.modules.security.service;
 
+import lombok.extern.slf4j.Slf4j;
 import me.zhengjie.modules.security.config.SecurityProperties;
 import me.zhengjie.modules.security.security.vo.JwtUser;
 import me.zhengjie.modules.security.security.vo.OnlineUser;
@@ -16,6 +17,7 @@ import java.util.*;
  * @Date 2019年10月26日21:56:27
  */
 @Service
+@Slf4j
 public class OnlineUserService {
 
     private final SecurityProperties properties;
@@ -131,4 +133,30 @@ public class OnlineUserService {
     public OnlineUser getOne(String key) {
         return (OnlineUser)redisUtils.get(key);
     }
+
+    /**
+     * 检测用户是否在之前已经登录，已经登录踢下线
+     * @param userName
+     */
+    public void checkLoginOnUser(String userName, String igoreToken){
+        List<OnlineUser> onlineUsers = getAll(userName);
+        if(onlineUsers ==null || onlineUsers.isEmpty()){
+            return;
+        }
+        for(OnlineUser onlineUser:onlineUsers){
+            if(onlineUser.getUserName().equals(userName)){
+                try {
+                    String token =EncryptUtils.desDecrypt(onlineUser.getKey());
+                    if(StringUtils.isNotBlank(igoreToken)&&!igoreToken.equals(token)){
+                        this.kickOut(onlineUser.getKey());
+                    }else if(StringUtils.isBlank(igoreToken)){
+                        this.kickOut(onlineUser.getKey());
+                    }
+                } catch (Exception e) {
+                    log.error("checkUser is error",e);
+                }
+            }
+        }
+    }
+
 }