Abstract: In order to improve the operational safety and stability of the underground mine power supply system, an automation control technology system consisting of layered protection, selective leakage protection, leapfrog trip protection, and power quality management was studied and constructed, and a three-layer architecture monitoring and execution system was designed. Conduct application verification in a certain mining area to compare and analyze the performance of protection actions, power quality indicators, and fault handling efficiency. The results show that the action time of the leakage protection has been reduced from 180 ms to 72 ms, the over level tripping rate has been reduced by about 60%, the fault location efficiency has been more than doubled, and the harmonic and voltage deviations have significantly converged. suggests that this system can effectively improve power supply continuity and intrinsic safety levels, and it is recommended to promote its application in similar mines.