The invention relates to an air filter assembly. The air filter assembly comprises a shell (1), a first impeller (22), a second impeller (23), a first rotating shaft (24), a first impeller cover (25),a second impeller cover (26), a filter element (2), a scraping blade (4) and a connecting pipe (27). The filter element (2) is rotatably connected with the shell (1), one end of the scraping blade (4) is connected with the shell (1), the other end of the scraping blade (4) is tightly attached to the peripheral wall of the filter element (2), a driving mechanism capable of driving the filter element (2) to rotate is arranged in the filter element (2), and a first air outlet (31) and a second air inlet (9) are communicated through a connecting pipe (27). The air filter assembly has the beneficial effects that on the basis of saving energy and protecting environment, in the use process, dust, sand dust and other dirt on the surface of the filter element can be cleaned and absorbed, the filter element is not prone to being stained, the air inlet amount of an engine is ensured, the engine can stably and normally work, and the service life of the filter element is greatly prolonged.