An outdoor device unit reset system, comprising a voltage regulation apparatus connected to a power supply apparatus and an outdoor device unit connected to the voltage regulation apparatus, wherein the voltage regulation apparatus is configured to regulate, based on a detected feedback signal, a supply voltage provided by the power supply apparatus for the voltage regulation apparatus, and a reference voltage of the voltage regulation apparatus, a working voltage input to the outdoor device unit; and the outdoor device unit is configured to: determine a change amount of the working voltage input to the outdoor device unit, and perform a reset operation when the change amount is within a preset range wherein the voltage regulation apparatus comprises a conversion circuit and a reset unit connected to the conversion circuit; the reset unit is configured to input the feedback signal to the conversion circuit; and the conversion circuit is configured to regulate, based on the feedback signal, the supply voltage, and the reference voltage, the working voltage input to the outdoor device unit, wherein the reset unit comprises a first resistor, a second resistor, a third resistor, and a reset switch; and a first end of the first resistor and a first end of the second resistor are connected to an output end of the conversion circuit, the output end of the conversion circuit is further connected to the outdoor device unit, a second end of the first resistor is connected to a first end of the reset switch, a second end of the second resistor is connected to a second end of the reset switch, the second end of the reset switch is further connected to a first end of the third resistor, the first end of the third resistor is further connected to a feedback end of the conversion circuit, and a second end of the third resistor is grounded. the voltage regulation apparatus is configured to regulate, based on a detected feedback signal, a supply voltage provided by the power supply apparatus for the voltage regulation apparatus, and a reference voltage of the voltage regulation apparatus, a working voltage input to the outdoor device unit; and the outdoor device unit is configured to: determine a change amount of the working voltage input to the outdoor device unit, and perform a reset operation when the change amount is within a preset range wherein the voltage regulation apparatus comprises a conversion circuit and a reset unit connected to the conversion circuit; the reset unit is configured to input the feedback signal to the conversion circuit; and the conversion circuit is configured to regulate, based on the feedback signal, the supply voltage, and the reference voltage, the working voltage input to the outdoor device unit, wherein the reset unit comprises a first resistor, a second resistor, a third resistor, and a reset switch; and a first end of the first resistor and a first end of the second resistor are connected to an output end of the conversion circuit, the output end of the conversion circuit is further connected to the outdoor device unit, a second end of the first resistor is connected to a first end of the reset switch, a second end of the second resistor is connected to a second end of the reset switch, the second end of the reset switch is further connected to a first end of the third resistor, the first end of the third resistor is further connected to a feedback end of the conversion circuit, and a second end of the third resistor is grounded.