With the increase in the modernization of coal mining enterprises, higher performance requirements are put forward for the power supply system. In the case of Sanjiaohe Mine, an advanced monitoring system was set to monitor the power supply network of the mine, the potential safety hazards in the power supply network system were found timely. The power supply monitoring system monitored the operation of the entire circuit, output data results for technical personnel, improved the scientific management of the mine's power supply network. The automated system was used to determine the safety problems such as leakage, short-circuit, and over-level tripping that often occur in the power supply network, avoided the errors in judgment caused by manual safety management work. The power supply monitoring system met the safety requirements of the Sanjiaohe Mine.