Air filter, engine and automobile

The invention relates to the technical field of automobiles, and discloses an air filter which comprises a shell, a support, a rotating part, a transmission shaft and at least two filter plates, a scraping plate is arranged between any two adjacent filter plates, the scraping plate is connected with the transmission shaft and can rotate along with the transmission shaft, the scraping plate extends in the radial direction of the transmission shaft, and the scraping plate is arranged close to the surface of the filter plate. The rotating piece drives the scraper to rotate, so that the scraper scrapes off dust accumulated on the surface of the filter plate, the automatic dust removal function is achieved, the air filter does not need to be manually and frequently cleaned, the cleaning and overhauling time is shortened, and the service cycle is long. And moreover, the scraper blade can continuously clean the air filter in real time, so that the ventilation and filtering effects of the air filter are ensured, and