Power supply device with power over Ethernet power supply and standby auxiliary power supply

The invention relates to the technical field of power supplies, and provides a power supply device with a power over Ethernet power supply and a standby auxiliary power supply. A switch control circuit is arranged on an access of the POE power supply, when the auxiliary power supply is available, the switch control circuit is disconnected to cut off the access of the POE power supply regardless the fact that the POE power supply is effective or not, and the auxiliary power supply supplies power for equipment. When the auxiliary power supply is not available, the switch control circuit is connected to enable the access of the POE power supply to be connected, and the POE power supply supplies power for the equipment. The total power consumption of a PSE end can be lowered by controlling the power supply modes effectively.