Self-cleaning filter

The utility model provides a self-cleaning filter which comprises a barrel, filter end sockets are arranged at two ends of the barrel and connected with the barrel through flanges, a driving device is arranged at the upper end of the barrel, a water outlet and an emptying port are arranged at the lower end of the barrel, a filter screen is arranged in the barrel, and the driving device is connected with the filter screen through a connecting piece. A water inlet and a drain outlet are formed in the left side and the right side of the barrel, a drain assembly is arranged on the outer wall of the barrel and comprises a stainless steel brush set and a scraper plate assembly, the stainless steel brush set and the scraper plate assembly each comprise a connecting pipe, a groove is formed in each connecting pipe, and the scraper plate assembly is connected with the drain outlet through a pipeline. The scraper scrapes off impurities which are not cleaned off by water flow on the filter screen, meanwhile, the impurit