The invention relates to a control method for air doors of a refrigeration chamber and a variable-temperature chamber of a single-circulation air-cooled refrigerator comprising a freezing chamber (F), the refrigeration chamber and the variable-temperature chamber (S). The control method mainly comprises a stable running process after a compressor is started, a control strategy of only considering temperature set values of the own sensors for opening of the air doors of the refrigeration chamber and the variable-temperature chamber is changed to a control strategy of mutual influence for the opening, opening time of the air doors of the refrigeration chamber and the variable-temperature chamber is overlapped, so as to shorten a non-cooling time of the freezing chamber and reduce a turn-on time of the refrigerator; and when the refrigeration sensor and the variable-temperature sensor achieve the respective limit values for closing the air doors, the respective air doors are directly closed without considering the mutual influence. The control method is capable of effectively reducing the power consumption of the refrigerator.