Abstract: Aim at defects of traditional coal mine information network such as functions’ decentralization, high cost, long establishing period and bad reliability, this paper presented the design principle for high efficiency and reliability of WLAN of coal mine and a framework of integrated WLAN of coal mine based on IEEE802.11 standardized protocols. This framework can realize transmission and exchange of integrated coal mine information of data, voice and video on one network,so it can reduce establishing cost and increase reliability of network effectively. The design used insulated method each other between physical layers of coal mine automation information network and communication network, so it ensured safety of coal mine automation information network.