Power supply device, air conditioning system, and power supply control method

The invention relates to the technical field of power supply, and provides a power supply device, an air conditioning system and a power supply control method. The power supply device comprises a main power supply, an uninterruptible power supply, a first switch device, a second switch device and identification management equipment; the main power supply is connected with a power supply inlet of the air conditioning equipment through the first switch device; the uninterruptible power supply is connected with a power supply inlet of the air conditioning equipment through the second switch device; the identification management equipment is connected with the first switch device, the second switch device and the air conditioning equipment, and the identification management equipment is configured to control the first switch device to be switched on and control the second switch device to be switched off when the identification card is inserted; when the identification card is pulled out, the first switching devi