Abstract: Design schemes of sensing layer, network layer and application layer of Internet of things of coal mine were introduced. Key technologies were pointed out in establishment of Internet of things of coal mine and corresponding solutions were proposed including identification system of Internet of things, integrated communication base station, distributed sensing technology of underground and interconnection and communication of heterogeneous networks. Specific applications of Internet of things of coal mine were analyzed in aspects of safety production and management, integrated multimedia communication, supervision of mine-used equipment and material, etc.