Air conditioner evaporator smudginess judgment method and device based on air volume sensor

The invention provides an air conditioner evaporator smudginess judgment method and device based on air volume sensors, the method and device are applied to an air conditioner, the air conditioner comprises an air conditioner evaporator, and an air inlet and an air outlet of the air conditioner are each provided with the air volume sensor. The method comprises the steps that the air inlet volume and the air outlet volume of the air conditioner are determined based on the air volume sensor; a smudginess reminding air volume value is obtained, and the smudginess reminding air volume value is determined according to the first-time air inlet air volume and the first-time air outlet air volume of the air conditioner in the first-time operation process; and whether the air conditioner evaporator is dirty or not is judged on the basis of the air inlet volume, the air outlet volume and the dirty reminding air volume value, so that the defect of inaccurate judgment caused by judging whether the air conditioner evapora