Abstract: This paper discusses the network protection of single-phase grounding of coal mine intelligent power supply system based on IEC 61850 communication standard. In view of the network protection by “net sampling and net tripping” way, the requirements for real-time sampling value of high-speed process layers are higher than that of traditional protection way, so the process layer sample value synchronization technology and GOOSE network delay are analyzed in the paper. Finally, in order to improve the traditional protection shortcomings, simplify the protection complexity and enhance the protection selectivity and reliability, the paper designs single phase grounding network protection operation logic and protection algorithm flow.