Control method of heating device of air conditioning system and air conditioning system

According to the control method of the heating device of the air conditioning system and the air conditioning system, auxiliary heating can be conducted on the air conditioning system through the heating device, and meanwhile the situation that the temperature of the heating device is too high or the temperature rises too fast is avoided. The control method comprises the following steps: an environment temperature detection step: detecting an initial indoor environment temperature; in the pre-judgment step, the initial indoor environment temperature and the air conditioner set temperature are compared, the initial indoor environment temperature and the preset environment temperature are compared, and if the conditions that the initial indoor environment temperature is smaller than the air conditioner set temperature and is not larger than the preset environment temperature are met, the circulation process is started; the circulation process comprises the following steps that circulation detection is conducted