Abstract: Aiming at the inconvenience of data acquisition using cable connection in underground mines, the wireless sensor network system was developed. Data collection by wireless sensor network can greatly reduce the work intensity. In this paper, the development of wireless sensor network system for data acquisition in coal mines has been introduced, including node classification,constitution of hardware and software workflow, and automatic networking of the system, communication distance and sinultaneous test have been experimented. The results show that the wireless sensor network system can meet the design requirements ans is convinient for underground data acquisition.