Abstract: For problems of short transmission distance, low transmission rate and small capacity existed in current mine-used broadcast system, a design of hardware of terminal of mine-used IP network broadcast based on Ethernet was proposed. Selections of the main controller, voice codecs, Ethernet network interface and audio amplifier, and matters needed attention in their use were focused on. The test results show that the maximum undistorted output voltage of signal of the terminal reaches 5.5-6 V, output power reaches 4 W, and signal distortion is less than 5%, which is fully able to meet the requirements of coal broadcast.