Air conditioner and control method and device of air conditioner

The invention discloses a control method and device of an air conditioner and the air conditioner. The method comprises the steps that the indoor environment temperature T1 is detected in real time after the air conditioner is started; the air conditioner is controlled to continuously run for the first preset time, and the indoor environment temperature obtained after the air conditioner continuously runs for the first preset time is recorded as T1Comp-one; according to the indoor environment temperature T1Comp-one, the running frequency of a compressor in the air conditioner is adjusted to be preset frequency; the compressor is controlled to continuously run for the second preset time at the preset frequency, and the indoor environment temperature obtained after the compressor continuously runs for the second preset time at the preset frequency is recorded as T1Comp-two; according to the indoor environment temperature T1Comp-two, the running frequency of the compressor is adjusted so that the indoor environment temperature T1 is in the preset temperature interval. According to the control method, the air conditioner can run in the energy-saving and comfortable state, and therefore the energy-saving and comfortable effect is achieved better.