Abstract: At present, there are problems about few application research of WiFi communication in the specific environment of fully mechanized coal mining face, propagation characteristics of WiFi signal on the fully mechanized coal mining face were analyzed combined with wireless signal spatial propagation theory. The analysis results show that on the fully mechanized coal mining face, the WiFi signal propagation is greatly affected, especially the signal coverage is obviously reduced; the WiFi signal propagation on the fully mechanized coal mining face conforms to log-distance path loss model. According to the spatial layout characteristics of fully mechanized coal mining face, an optimal technical scheme of no-dead zone and full coverage WiFi communication network of fully mechanized coal mining face was constructed by fast roaming technology and Mesh network technology. The test results show that the scheme can solve the problem of video communication on the shearer, and realize fast roaming function of WiFi network, can effectively ensure the application effect of the mobile terminal, and the average communication throughput of the whole network is about 35 Mbit/s, the minimum communication throughput is about 7 Mbit/s, which can meet most of the communication needs on fully mechanized coal mining face.