The routine use of shore power and the coordination between ships and shore will become key links in improving the atmospheric environment of ports. Ships approaching the port will be connected to shore power more frequently, which will inevitably increase the frequency of electrical equipment usage and the workload of operation and maintenance of shore power equipment in the shore based power supply system. This article conducts research on the technical requirements for the operation and maintenance of the main electrical equipment in the dock shore power supply system, analyzes typical electrical faults, and standardized maintenance management is an important measure to ensure efficient and routine use of shore power. It provides technical support for the stable and reliable use of shore power by ships, and improves the utilization rate of port shore power.