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In order to transmit the coal mine multi-service in the unified platform, the status and development of the coal mine multi-service system for monitoring are researched. According to the different service requirements in coal mine, the model of the coal mine multi-service based on soft-switch is proposed; the Architecture of the coal mine multi-service based on soft-switch is designed. In the platform, the video and voice information are encoded and decoded by MPEG-4, signal and media stream are transmitted by UDP and RTP, control signal of multi-service is transmitted by SIP and DMIF. We realize the multi-service system based on soft-switch. The test platform of multi-service system to confirm the system function, and the communication signal is captured and analyzed by the ethereal protocol packet tracking tool. The test results show that the system can transmit the coal mine multi-service in the unified platform, and the multi-service system has a good compatibility and scalability.