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 (R1), a second resistor (R2), a third resistor (R3), and a reset switch (K); and a first end of the first resistor (R1) and a first end of the second resistor (R2) 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 (R1) is connected to a first end of the reset switch (K), a second end of the second resistor (R2) is connected to a second end of the reset switch (K), the second end of the reset switch (K) is further connected to a first end of the third resistor (R3), 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 (R3) 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 (R1), a second resistor (R2), a third resistor (R3), and a reset switch (K); and a first end of the first resistor (R1) and a first end of the second resistor (R2) 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 (R1) is connected to a first end of the reset switch (K), a second end of the second resistor (R2) is connected to a second end of the reset switch (K), the second end of the reset switch (K) is further connected to a first end of the third resistor (R3), 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 (R3) is grounded. <EOS>