The stationary shore power device is a high-power variable frequency power supply device specially designed and manufactured for the harsh environment of the seashore terminal with high humidity, high corrosion, and heavy load impact. The stationary inverter power supply system using power electronic technology converts the shore power supply into a frequency and voltage source suitable for the needs of ships. During the ship's berthing at the port, the diesel motor on the ship is stopped, and the shore power device provides power directly to the electrical equipment on the ship through the cable. In this way the pollution and emission in the port area is effectively controlled.