diff --git a/app/modules/slack/__init__.py b/app/modules/slack/__init__.py
index 4f6d3cff..69a5602c 100644
--- a/app/modules/slack/__init__.py
+++ b/app/modules/slack/__init__.py
@@ -193,10 +193,15 @@ class SlackModule(_ModuleBase, _MessageBase[Slack]):
         if not client_config:
             return None
         try:
-            msg_json: dict = json.loads(body)
+            msg_json = json.loads(body)
+            while isinstance(msg_json, str):
+                msg_json = json.loads(msg_json)
         except Exception as err:
             logger.debug(f"解析Slack消息失败：{str(err)}")
             return None
+        if not isinstance(msg_json, dict):
+            logger.debug(f"Slack消息格式无效：{type(msg_json)}")
+            return None
         if msg_json:
             images = None
             if msg_json.get("type") == "message":
diff --git a/app/modules/telegram/__init__.py b/app/modules/telegram/__init__.py
index 547ebc08..050260bf 100644
--- a/app/modules/telegram/__init__.py
+++ b/app/modules/telegram/__init__.py
@@ -131,11 +131,21 @@ class TelegramModule(_ModuleBase, _MessageBase[Telegram]):
             return None
         client: Telegram = self.get_instance(client_config.name)
         try:
-            message: dict = json.loads(body)
+            message = json.loads(body)
+            while isinstance(message, str):
+                message = json.loads(message)
         except Exception as err:
             logger.debug(f"解析Telegram消息失败：{str(err)}")
             return None
 
+        if not isinstance(message, dict):
+            logger.debug(f"Telegram消息格式无效：{type(message)}")
+            return None
+
+        # 兼容某些转发链路使用 Telegram Update 外壳
+        if "message" in message and isinstance(message.get("message"), dict):
+            message = message.get("message")
+
         if message:
             # 处理按钮回调
             if "callback_query" in message:
diff --git a/app/modules/telegram/telegram.py b/app/modules/telegram/telegram.py
index 7161996a..1e1375cc 100644
--- a/app/modules/telegram/telegram.py
+++ b/app/modules/telegram/telegram.py
@@ -1,4 +1,5 @@
 import asyncio
+import json
 import re
 import threading
 import time
@@ -113,7 +114,11 @@ class Telegram:
                 if self._should_process_message(message):
                     # 启动持续发送正在输入状态
                     self._start_typing_task(message.chat.id)
-                    RequestUtils(timeout=15).post_res(self._ds_url, json=message.json)
+                    payload = self._serialize_update_payload(message)
+                    if not payload:
+                        logger.warn("Telegram消息序列化失败，跳过转发")
+                        return
+                    RequestUtils(timeout=15).post_res(self._ds_url, json=payload)
 
             @_bot.callback_query_handler(func=lambda call: True)
             def callback_query(call):
@@ -208,6 +213,23 @@ class Telegram:
             logger.error(f"下载Telegram文件失败: {e}")
         return None
 
+    @staticmethod
+    def _serialize_update_payload(message: Any) -> Optional[dict]:
+        """
+        将 Telegram Message 对象稳定序列化为 dict，避免 requests 的 json 参数再次包一层字符串。
+        """
+        try:
+            if hasattr(message, "to_dict"):
+                payload = message.to_dict()
+            else:
+                payload = getattr(message, "json", None) or message
+            if isinstance(payload, str):
+                payload = json.loads(payload)
+            return payload if isinstance(payload, dict) else None
+        except Exception as e:
+            logger.error(f"序列化Telegram消息失败: {e}")
+            return None
+
     def _update_user_chat_mapping(self, userid: int, chat_id: int) -> None:
         """
         更新用户与聊天的映射关系
diff --git a/tests/test_agent_image_support.py b/tests/test_agent_image_support.py
index d52e0d08..c1948cc6 100644
--- a/tests/test_agent_image_support.py
+++ b/tests/test_agent_image_support.py
@@ -1,4 +1,5 @@
 import base64
+import json
 import unittest
 from types import SimpleNamespace
 from unittest.mock import Mock, patch
@@ -7,6 +8,7 @@ from app.agent.tools.impl.send_message import SendMessageInput
 from app.chain.message import MessageChain
 from app.core.config import settings
 from app.modules.slack import SlackModule
+from app.modules.telegram.telegram import Telegram
 from app.modules.telegram import TelegramModule
 from app.schemas import CommingMessage
 from app.schemas.types import MessageChannel
@@ -26,6 +28,51 @@ class AgentImageSupportTest(unittest.TestCase):
             ["tg://file_id/large", "tg://file_id/doc-image"],
         )
 
+    def test_telegram_message_parser_accepts_double_encoded_body(self):
+        module = TelegramModule()
+        body = json.dumps(
+            json.dumps(
+                {
+                    "message": {
+                        "from": {"id": 10001, "username": "tester"},
+                        "chat": {"id": 10001, "type": "private"},
+                        "photo": [{"file_id": "small"}, {"file_id": "large"}],
+                    }
+                }
+            )
+        )
+
+        with patch.object(
+            module,
+            "get_config",
+            return_value=SimpleNamespace(name="telegram-test", config={}),
+        ), patch.object(
+            module,
+            "get_instance",
+            return_value=SimpleNamespace(bot_username=None),
+        ):
+            message = module.message_parser(
+                source="telegram-test", body=body, form={}, args={}
+            )
+
+        self.assertIsNotNone(message)
+        self.assertEqual(message.images, ["tg://file_id/large"])
+
+    def test_telegram_forward_payload_uses_dict_not_json_string(self):
+        payload = Telegram._serialize_update_payload(
+            SimpleNamespace(
+                to_dict=lambda: {
+                    "text": "hi",
+                    "photo": [{"file_id": "image-1"}],
+                }
+            )
+        )
+
+        self.assertEqual(
+            payload,
+            {"text": "hi", "photo": [{"file_id": "image-1"}]},
+        )
+
     def test_process_allows_image_only_message(self):
         chain = MessageChain()
         message = CommingMessage(