Abstract: A carbon monoxide sensor based on wireless Mesh network technology was designed according to usage characteristics of sensor equipment in mobile environment of coal mine working face, and hardware circuit design and its low power consumption work mechanism were introduced in details. The test results show that the sensor realizes real-time and accurate on-line monitoring of underground carbon monoxide concentrations and has characteristics of fast networking speed, strong ability of anti-interference and obstacle avoidance, long wireless communication distance and low power consumption, which especially is suitable for application on working face with more equipment and complex environment.