Air filter

The invention provides an air filter, and belongs to the technical field of motorcycle engine air inlet. The problem that the stability of the air-inflow-adjustable air filter is poor is solved. The air filter comprises a shell with a main air inlet, an air inlet channel communicated with an inner cavity is formed in the shell, a cover plate is hinged to the position, close to the lower side wall, of the shell in the air inlet channel, the swing end of the cover plate is arranged in the inlet direction of the air inlet channel, and a driving part capable of driving the cover plate to swing is arranged on the shell. The swing end of the cover plate can swing towards the upper side wall of the air inlet channel to abut against the shell to close the air inlet channel under driving of the driving piece, and when the air inlet channel is closed, the cover plate is obliquely arranged in the air inlet channel. When the driving piece drives the cover plate to rotate to close the auxiliary air inlet, the whole cover