Power supply protection device and method

The invention provides a power supply protection device and method; and the device comprises an overheating protection module, a processing module, an output module, and an interface module; the processing module is connected with the overheating protection module and the output module, the output module is connected with the interface module, and the interface module is used for being connected with a power supply of an external electric appliance. The overheating protection module is used for sending an overheating feedback signal to the processing module when detecting that the working temperature of an external electric appliance is greater than a preset temperature threshold; the processing module is used for sending a current adjusting instruction to the output module when receivingthe overheating feedback signal; and the output module is used for sending the current adjusting instruction to a power supply through the interface module, so as to adjust the current input to the external electric appliance