How to Build a Python WeChat Bot that Monitors Group Chats

Requirement Analysis

1. What the "goddess" is talking about

You may have a crush on a colleague who frequently chats in the company group, and you want to follow her conversations to find common interests, but as a programmer you are busy every day.

2. What the boss is instructing

In the large company group, the boss might announce that fruit is available for everyone, but when you check the message you find only the female colleague got the fruit, leaving you without any snack.

3. Changing requirements again

After you finally implement a feature, the product manager rejects it, saying the change was already communicated in the project group and you were @mentioned, but you missed it because you were focused on coding, leading to overtime work.

Feature Design

Based on the above analysis, we design the functionality: we want to listen to certain groups and record everything said by specific people, and ideally forward the records to WeChat for easier viewing.

Implementation

In the previous article we introduced how to create a WeChat robot that chats with friends using the wxpy library; this time we will use the same library for group‑chat related features.

1. Receiving group messages

We can receive group messages and even add the robot to a group so that members can interact with it.

2. Filtering useful group messages

After receiving group messages, we compare the group name with the list of groups we want to monitor, and then check whether the sender is in the list of target users (preferably using remarks to avoid duplicate WeChat nicknames).

Configuration file example:

Based on the configuration, the robot filters messages from the specified groups and users.

3. Forwarding useful group messages

After obtaining useful messages, we can save them in various ways (files, databases, etc.) or simply forward them. Forwarding is simple, real‑time, and provides permanent storage.

The messages can be forwarded to a designated friend or the file‑assistant. In the demo code they are forwarded to the robot administrator; if no administrator is set, they go to the file‑assistant.

Administrator setting tips: if you log in with a secondary account, set your primary account as the administrator; otherwise the file‑assistant is used as the default administrator.

Demo

Summary

The second phase of the WeChat robot is now complete. In addition to the new 监听模式 (listening mode), the following features have been added:

Robot group chat: let the robot join groups so members can interact with it.

Forward mode: forward important boss instructions to other groups.

Monitoring mode: monitor shared links in the group to detect advertisements quickly.

Administrator control: after setting an administrator, you can remotely toggle the robot’s functions.

You can freely customize the robot according to your daily needs.

GitHub project: https://github.com/pig6/wxrobot wxpy documentation: https://wxpy.readthedocs.io/zh/latest

After downloading the code you can run it directly without modification; a wxpy cheat sheet is also provided.