The invention provides an air conditioner control method, an air conditioner control system and an air conditioner. The air conditioner control method comprises the steps that the working state of theair conditioner and the temperature of a heat exchanger are detected; and when the air conditioner is in a defrosting state or an oil return state and the lasting time in which the temperature of theheat exchanger is lower than the first preset temperature is longer than the first preset duration, a fresh air ventilator is controlled to continue to run. According to the air conditioner control method, if special working conditions such as defrosting and oil return are carried out when the air conditioner is controlled to run in a heating state in the low-temperature environment, the fresh air ventilator is controlled to continue to run, so that the problem that the fresh air ventilator is frequently started and stopped due to the fact that the environment temperature or the temperature of the heat exchanger exceeds the heating operation range of the fresh air ventilator is avoided, the reliability of the fresh air ventilator is ensured, and customer satisfaction of products and usingexperience of users are improved.