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An early-warning and explosion-proof monitoring system for coal mine environment is designed based on ZigBee, in view of the underground special environment. The underground system ,with CC2530 + CC2401 chip as the core of ZigBee node, realizes communication with upper computer through CAN bus by the central controller. Upper computer uses the Labview software to program and realize real-time display of the coal mine parameters including CH4, CO, O2 concentration, temperature and humidity and personnel coordinates. The early warning technology based on fuzzy logic algorithm, explosion-proof technology based on physical isolation are adopted to this system. A kind of RSSI weighted centroid algorithm mixed with LQI was put forward. Experiment proved that this system runs stably, improving the personnel positioning accuracy and has a good prospect of application.