Direct current socket and power supply method thereof

According to the direct current socket and the power supply method thereof, a primary winding of an isolation transformer is connected to an external direct current power supply, high-voltage direct current electric energy output by the direct current power supply is directly transmitted to the isolation transformer for voltage reduction processing, and finally low-voltage direct current electric energy meeting user requirements is output to a direct current power supply port. When the direct-current electric appliance takes electricity, the direct-current power supply port only needs to be inserted, the control device can control the operation states of the switching device and the rectifying device in combination with the output direct current output to the direct-current power supply port by the isolation transformer, and therefore power supply control over the direct-current electric appliance is achieved. According to the scheme, the direct-current electric energy is subjected to voltage conversion at th