Abstract: In order to solve the problem existing in coal mine safety monitoring system, the remote power-off based on the ground host computer is limited by the inspection cycle, which causes a long response delay and cannot be implemented normally when downhole communication with the surface network fails. This paper designs a method for autonomously realizing rapid remote power-off based on underground substations. This method is based on UDP network protocol with high real-time performance and the characteristics of multi-node data transmission. The application layer software implementation is to increase the response mechanism to ensure communication data accuracy and reliability, realize that when the environmental parameters of the coal mine are abnormal, the substations can independently realize the remote power failure. Laboratory tests and on-site industrial experiments show that the power-off method is faster and more stable than existing implementations.