Air filter device

The invention relates to an air filter device which comprises a second shell (2), a filter element, a first turbine (3), a first turbine hood (4), a first rotary shaft (5) and a scraping blade (6). The filter element is cylindrical. A second air outlet (19) communicates with a filter element inner cavity through an inner cavity of the first turbine hood (4). The first turbine (3) and the filter element are both connected to the first rotary shaft (5). The first turbine (3) is located in the inner cavity of the first turbine hood (4) and rotationally connected with the first turbine hood (4) through the first rotary shaft (5). The filter element is rotationally connected with the second shell (2) through the first rotary shaft (5). One end of the scraping blade (6) is tightly attached to the peripheral wall of the filter element. The air filter device has the advantages that when in use, the air filter device can remove dirt such as dust and fine sand adsorbed to the surface of the filter element, accordingly,