Energy-saving control method and device for air conditioner, air conditioner and medium

The invention relates to an energy-saving control method and device for an air conditioner, the air conditioner and a medium. According to the method, the set temperature of the target air conditioner and the environment temperature of the environment where the target air conditioner is located can be obtained; calculating a temperature difference value based on the set temperature and the environment temperature; determining a target temperature interval to which the temperature difference value belongs; if the target temperature interval is the first temperature interval, the target operation frequency of the target air conditioner is controlled and adjusted to be a preset lower limit frequency value; if the target temperature interval is the second temperature interval, the target operation frequency is determined based on the target temperature difference value, and the target air conditioner is controlled to operate at the target operation frequency; wherein the highest temperature value corresponding to