The invention discloses a control method for preventing blowing of hot air during refrigeration of an air conditioner. The control method comprises the following steps: 1, under a refrigeration mode, opening an air guide door of an air conditioner indoor unit and turning on a compressor and a fan of an air conditioner outdoor unit; 2, measuring indoor environmental temperature and temperature of a heat exchanger of the air conditioner indoor unit, and calculating a difference value sigmaT between the indoor environmental temperature and the temperature of the heat exchanger; 3, when the difference value sigmaT is greater than or equal to an upper limit value T1 of a preset temperature region, not turning on a fan of the air conditioner indoor unit, and going to the step 2, if not, turning on the fan of the air conditioner indoor unit. The control method disclosed by the invention has the advantage of avoiding blowing of the hot air during starting of the air conditioner.