Self-cleaning filter and control method

The invention provides a self-cleaning filter and a control method, the self-cleaning filter comprises a filter body, a crusher, a sewage pump, a sewage valve and a stop check valve, the filter body, the crusher, the sewage pump and the sewage valve are sequentially communicated through a pipeline to form a sewage discharge channel, one end of the stop check valve is communicated with the filter body, and the other end of the stop check valve is communicated with the crusher. One end of the filter body is connected with the crusher, the other end of the filter body is connected with a pipeline between the sewage pump and the sewage valve, the filter body, the crusher, the sewage pump and the stop check valve are sequentially communicated through the pipeline to form a sewage circulation channel, a filter screen and a cleaning unit are arranged in the filter body, and the filter screen is used for filtering impurities in sewage. According to the self-cleaning filter and the control method, the impurities on th