diff --git a/app/common/server/Wx.php b/app/common/server/Wx.php
index db49cb1..9c21763 100755
--- a/app/common/server/Wx.php
+++ b/app/common/server/Wx.php
@@ -214,7 +214,7 @@ class Wx extends MyController
     public function get_access_token()
     {
         $redis = (new \app\common\server\RedisHelper())->getRedis();
-        $redis_key = 'wx_access_token';
+        $redis_key = 'wx_access_token:' . self::$wx_appid;
 
         $access_token_info = $redis->get($redis_key);
         if ($access_token_info) {