Abstract: For problems of wired while drilling device (MWD) which used central cable drilling rig as signal transmission channel such as complex drilling rig structure, limited mechanical behavior, poor anti-interference performance and so on, a mine-used mud pulse wireless MWD device was developed. The device is composed of explosion-proof computer, explosion-proof keyboard, explosion-proof data memory, explosion-proof measuring tube, explosion-proof pressure transmitter, etc. It works in intermittent mode. When shutdown signal of mud pump is detected by measuring section of the explosion-proof measuring tube, static data including drilling trajectory parameter and state parameter of directional drilling tool is collected and coded. When opening signal of mud pump is detected, following works are done by driving section of the explosion-proof measuring tube including sending the static data, measuring and sending dynamic data, and controlling the pulse generator to adjust flow channel area of hydraulic conduit. The explosion-proof pressure transmitter collects pressure signal of mud pump and sends it to the explosion-proof computer. When data transmission is completed, the explosion-proof measuring tube stops working, flow channel inside the pulse generator is restored, mud pump pressure is changed to normal value, then directional drilling is started. The test result shows that the device runs stably with correct measurement data and improves efficiency and safety of directional drilling, which can meet directional drilling need of all kinds of coal-seam or rock-seam drilling holes and realize measurement while drilling of traditional drilling trajectory.