diff --git a/plugins/mongodb/index.py b/plugins/mongodb/index.py
index e49f1f910..a35fdd001 100755
--- a/plugins/mongodb/index.py
+++ b/plugins/mongodb/index.py
@@ -203,20 +203,48 @@ def mongdbClientS():
         client = pymongo.MongoClient(host=ip, port=int(port), username='root', password=mg_root, authSource='admin')
     return client
 
+def getMongoDBVersion():
+    '''获取MongoDB版本号'''
+    import pymongo
+    port = getConfPort()
+    ip = getConfLocalIp()
+    try:
+        # 先不使用认证连接
+        client = pymongo.MongoClient(host=ip, port=int(port), serverSelectionTimeoutMS=5000)
+        db = client.admin
+        serverStatus = db.command('serverStatus')
+        version = serverStatus.get('version', '4.0')
+        client.close()
+        return version
+    except Exception as e:
+        # 如果无法获取版本，默认返回 4.0（新版本兼容模式）
+        return '4.0'
+
+def isMongoDB3x():
+    '''判断是否为MongoDB 3.x版本'''
+    version = getMongoDBVersion()
+    # 匹配 3.x 版本
+    if version.startswith('3.'):
+        return True
+    return False
+
 def mongdbClient():
     import pymongo
     port = getConfPort()
     auth = getConfAuth()
     ip = getConfLocalIp()
     mg_root = pSqliteDb('config').where('id=?', (1,)).getField('mg_root')
-    # print(ip,port,auth,mg_root)
+    
     if auth == 'disabled':
         client = pymongo.MongoClient(host=ip, port=int(port))
     else:
-        # uri = "mongodb://root:"+mg_root+"@127.0.0.1:"+str(port)
-        # client = pymongo.MongoClient(uri)
-        # 使用 admin 数据库进行认证，兼容 MongoDB 3.0
-        client = pymongo.MongoClient(host=ip, port=int(port), username='root', password=mg_root, authSource='admin')
+        # 根据MongoDB版本选择认证方式
+        if isMongoDB3x():
+            # MongoDB 3.x 使用 authSource 指定认证数据库
+            client = pymongo.MongoClient(host=ip, port=int(port), username='root', password=mg_root, authSource='admin')
+        else:
+            # MongoDB 4.x+ 默认在 admin 数据库认证
+            client = pymongo.MongoClient(host=ip, port=int(port), username='root', password=mg_root)
     return client