Rotational speed control method and device, air conditioner and computer readable storage medium

The invention provides a rotational speed control method and device, an air conditioner and a computer readable storage medium. The rotational speed control method comprises the steps of enabling theair supply angle of an air guide assembly to correspond to the rotational angle of a motor and detecting the air supply mode of the air guide assembly and the rotational angle of the motor; and conducting rotational speed compensation on an indoor draught fan according to the rotational angle of the motor if the air supply mode is determined as directional air supply. Through the technical schemeof the rotational speed control method and device, linkage control over the rotational speed of the indoor draught fan and the air guide assembly can be realized, and the problem of air volume attenuation caused by the excessive swing angle of a shutter in the air guide assembly is solved. While the requirement of a user for the air blowing angle is met, the air output capacity is effectively compensated, and use experienc