Abstract: This paper designs a roof pressure monitoring system for coal mine. The hardware is based on the Zigbee wireless transmission module and MSP430 microcontroller. The wireless module uses built-in protocol stack Zigbee module and makes communication with the MSP430 microcontroller through the AT command. The wireless transmission admits point-to-point transport protocol, it can effectively extend the communication distance. The devices can display real-time pressure data by the help of digital tube, and test outside environment by using a photoelectric triode. When a miner's lamp irradiate, the digital tube displays, devices are turned off to reduce power consumption in the darkness. Receiving sub-station sends pressure data to the ethernet switch through RS485 cable.