The invention provides a low-temperature refrigeration control method, a low-temperature refrigeration control device and an air conditioner. The low-temperature refrigeration control method comprises the steps that in a low-temperature refrigeration mode, the outlet temperature of an outdoor condenser of the air conditioner is detected through a temperature sensor; the detected outlet temperature of the outdoor condenser is judged to be smaller than or equal to a preset outlet temperature or not; and according to the judging result, the covering area of a wind baffling device which is arranged outside the outdoor condenser of the air conditioner is adjusted. By adopting the technical scheme disclosed by the invention, the heat exchange between the outdoor condenser and the external environment is weakened; the pressure of an outdoor refrigerant is maintained at a reasonable range, and the problems of frosting, liquid slugging and the like caused by over-low pressure of the outdoor refrigerant are avoided; the operation safety of the air conditioning system at a low-temperature outdoor environment temperature is increased; and the user experience is improved.