Abstract: In view of the traditional coal mine roof separation layer monitoring system maintenance difficult, inconvenient installation, low flexibility, and the unstable signal transmission, high power consumption and short service period of the wireless monitoring system, a roof separation layer monitoring system with WaveMesh protocol as wireless communication network and STM32 microcomputer as main control chip is designed. Based on the structure of master and slave station, the system is connected with the layer separation instrument, which is responsible for collecting displacement data; the master station is responsible for data storage and communication with the well via optical fiber, WaveMesh low power wireless ad-hoc network is used to realize data transmission between the master and slave stations. The field application results show the system has stable signal transmission, reliable operation and low power consumption, which can meet the requirements of long time underground work.