Air duct lineation fixing tool

The utility model relates to the technical field of air duct lineation, and discloses an air duct lineation fixing tool which comprises two sliding rails arranged in parallel, two supporting frames used for supporting an air duct are installed on each sliding rail, the portions, making contact with the air duct, of the supporting frames are inclined surfaces, and the inclined surfaces of the two supporting frames on the same sliding rail form a V shape. A groove is formed in the surface, making contact with the supporting frame, of the sliding rail, the bottom space of the groove is larger than the opening space, a sliding block is embedded in the groove, a through hole is formed in a bottom beam, making contact with the sliding rail, of the supporting frame, a mounting hole is formed in the sliding block, and the supporting frame sequentially penetrates through the through hole and the mounting hole through a connecting piece to be mounted on the sliding rail. The two supporting frames on each sliding rail c