The invention provides an air conditioner heating mode frequency control method. When a compressor of the air conditioner is in a heating mode, the compressor working frequency is corrected through a PID algorithm, and if the compressor is stopped, the compressor stopping starting initial frequency is determined through the outdoor environment temperature. By the aid of the method, the determination of the initial frequency can respond to temperature changes timely, and accordingly, the frequency can be improved and reduced effectively; the air conditioner running is stable, the indoor environment temperature fluctuation is small, the frequent starting and stopping of the compressor can be prevented, and the user experience is good; the running of the air conditioner is not affected by outside weather changes, frequency parameters can be adjusted according to weather conditions and are optimized through a large number of experiments, accurate initial frequencies can be given in special days, the frequency is adjusted according to the environment temperature, and accordingly, the air conditioner stable running can be guaranteed, and the temperature can be adjusted rapidly.