The invention discloses an anti-vibration adjustable air door. The anti-vibration adjustable air door comprises a shell, vanes, shafts, a linkage ring, a connector and a connecting rod. The shell is a cylinder, shaft bases are evenly distributed on the cylinder wall, the connector arranged inside the shell is provided with positioning holes matched with the shaft bases, the shafts are installed between the positioning holes of the connector and the corresponding shaft bases, and the ends of the shafts are fixedly connected with driving levers. At least three idler wheels are evenly distributed on the outer wall of the shell, and the inner wall of the linkage ring is matched with the idler wheels. Limiting pins are installed on the linkage ring in the radial direction, and the linkage ring limits the driving levers from rotating by 90 degrees rightwards along with the shafts through a connecting rod external connection power device. The sector-shaped vanes are evenly arranged on the shafts and integrally connected with the shafts, due to the fact that the rear faces of the vanes are supported by the shafts, the effect of a longitudinal rib enhancement structure is achieved, and the rigidity of the vanes is remarkably improved; due to the fact that no deformation or vibration is generated in the pressure bearing process, noise is low, rotation is easy, the angles of the vanes can be adjusted at will within the 90-degree rightward rotation range, and the requirements of a matched induced draft fan for variable working condition air output are met.