Automatic air door structure on brush cutter

The utility model relates to an automatic air door structure on a brush cutter, which comprises an air filter seat, a carburetor, a choke valve, a handle, a rotating shaft, an elastic piece, a torsion spring and a sliding block, the carburetor is arranged on the air filter seat, and an air inlet is arranged on the air filter seat; the rotating shaft is rotatably mounted on the air filter seat; the handle and the choke valve are respectively fixed at two ends of the rotating shaft; the sliding block is installed on the air filter base in a sliding mode, and the elastic piece is installed on the air filter base. A push block is arranged at the left end of the sliding block, a driving block is arranged on the carburetor, the driving block is located on one side of the push block, the rotating shaft is located on one side of the right end of the sliding block, a first clamping groove and a second clamping groove are formed in the right end of the sliding block, a limiting protrusion is arranged on the rotating sh