Abstract: To solve shortcomings that coal mine underground broadcasting system has short transmission distance, bad anti-interference ability, need separate wiring and only makes whole network voice broadcasting because it uses analog audio broadcasting way, the paper put forward a design scheme of new kind of mine-used digital broadcasting system. It introduced structure, main function, software and hardware design of the system in details. The system adopts computer technology, network technology and audio stream technology, which will make collected real-time radio signal quantization, coding, compression, cache, and transmit to Internet radio terminals by IP packets and broadcast according to the network transmission agreement. The system solves shortages of traditional analog audio broadcast. The laboratory test and operation results showed that the system is stable and reliable, sound and video playback is fluent, operation is simple, which can meet with mine actual needs.