Double-frequency power supply device for ship shore power system

The invention discloses a double-frequency power supply device for a ship shore power system. The double-frequency power supply device is characterized by comprising a transformer I and a transformer II, wherein the transformer I is directly connected with a 50Hz power supply of a port power grid; the output end of the transformer I is connected to a 50Hz bus; the transformer II is directly connected with the 50Hz power supply of the port power grid; the output end of the transformer II is connected with a high-voltage frequency conversion power supply; the output end of the high-voltage frequency conversion power supply is connected with a 60Hz bus; and an output of a conversion switch for conversion between the 50Hz bus and the 60Hz bus passes through an isolation transformer and is connected with a high-voltage power connection box. The double-frequency power supply device simultaneously supplies 50Hz power and 60Hz power; and when a plurality of berths are needed to be powered, different voltages can be supplied.