Abstract: In this paper, the wireless life signs detection technology applied in coal mine is put forward based on ZigBee. The constitution of life signs detector is elaborated, and the acquisition and wireless transmission of life signs signals is mainly studied, such as heartbeat detection, breath test, body temperature detection and so on.By using the detector, the rescue efficiency will be greatly improved, the safety of rescue personel will be ensured, and the secondary casualties can be avoided, which has the great significance for coal mine emergency rescue.