Abstract: The wireless network coverage scheme of Wi-Fi 6 in underground coal mine is designed to solve the problem that 5G communication cannot achieve the whole mine signal coverage in underground coal mine. Wi-Fi 6 technology is described from technical principle, networking mode, antenna design, power consumption calculation and other aspects. Wi-Fi 6 signal coverage scheme solves the problem of unwired signal coverage of long-distance roadway in coal mine, and realizes full wireless network coverage in coal mine. The data from laboratory tests and mine roadway simulation tests show that Wi-Fi 6 network scheme has the characteristics of wide coverage area, fast communication speed and low power consumption, and can fully meet the requirements of full wireless coverage in underground coal mine.