Air filter and engine with air filter

The invention discloses an air filter and an engine with the air filter. The air filter comprises a shell containing a filter element. The shell is provided with an air inlet and an ash discharging device. The inner wall of the shell is provided with a continuous spiral sliding groove between the air inlet and the ash discharging device. One end of the spiral sliding groove is smoothly connected with the air inlet. Under the action of centrifugal force of spiral wind, heavy particles in the air are thrown into the spiral sliding groove in a concentrated mode, move in the spiral direction of the spiral sliding groove and move to the ash discharging device, so that the defect that in traditional technologies, dust is dispersed and cannot be easily collected and discharged is overcome, the filtering pressure of the filter element is reduced, the service life of the air filter is prolonged, and the use performance of the air filter is ensured. The engine with the air filter is good in stability. 本发明公开了一种空滤器及具有该空滤