Embodiments of the invention disclose a method and device for detecting filth blockage of a filter screen and relates to the field of household electrical appliances. The method and device can reducethe cost and improve the detection efficiency during detection of the filth blockage of the filter screen. A specific solution is as follows: after a filth blockage detection sensor emits light havinga preset strength, reflected light of the filter screen is received, the type of the filter screen is determined according to the strength of the reflected light, an algorithm and parameters, which are corresponding to the type of the filter screen are determined, and the filth blockage of the filter screen is detected by using the algorithm and the parameters. The method and device for detectingthe filth blockage of the filter screen are used for detecting filth blockage of filter screens in the case that the distances between the filter screens of different types and a filth blockage detection sensor are the same.