Air conditioner control method and device, air conditioner and storage medium

The invention discloses a control method and device of an air conditioner, the air conditioner and a storage medium, an indoor unit of the air conditioner is provided with a humidifying system, and the humidifying system comprises a water storage tank, an electric heating assembly and a humidifying pipe; one end of the humidifying pipe is connected to the water storage tank, and the other end is provided with a nozzle and a valve for controlling opening and closing of the nozzle. The method comprises the steps that after the air conditioner is in a refrigeration mode and a self-cleaning function is started, the opening and closing state of a valve and the starting and stopping state of an electric heating assembly are controlled according to the air temperature in a humidifying pipe and the air pressure in the humidifying pipe; and then, according to the air temperature in the humidifying pipe, the air outlet temperature of the indoor unit and the indoor environment temperature, the opening and closing state