Abstract: According to the safety application requirements of coal mine 5G communication system, the safety application technology of 5G core network side and wireless access side is studied. On the core network side, a private network technology and a network slicing technology are adopted to realize the physical isolation of different coal mine business scenarios. A proportional fair algorithm is adopted to optimize the allocation of resource blocks in a slicing group to realize the slicing resource scheduling and guarantee the safe and reliable transmission of coal mine business data. On the wireless access side, the antenna isolation circuit is designed to realize the intrinsic safety of the output signal of the base station, and the RF threshold power of the 5G base station is limited to 6 W so as to eliminate the potential safety danger caused by radiated energy, and to realize the safe access of a variety of underground mine terminal device. The underground test results show that the wireless coverage radius of the 5G base station is 100 m, the signal strength in the coverage area is not less than 100 dB, the upload rate is not less than 520 Mbit/s, the average communication delay is 18.56 ms, and the user service performance is improved by 52.8% when the number of users is 200. On the basis of ensuring the safety and reliability of the communication system, the 5G base station meets the requirements of multiple concurrency, large capacity, high speed and low delay wireless communication of coal mine business data.