Fixing device for leather sewing

The utility model relates to the technical field of leather sewing, in particular to a fixing device for leather sewing, which comprises a clamping frame and further comprises a clamping plate structure, the clamping plate structure comprises a bottom plate, the bottom plate is used for bearing leather, the bottom plate is movably mounted in a groove of the clamping frame, and the bottom plate is connected with a cover plate through a threaded part; the flattening structure comprises rotating supporting frames fixedly installed on the two sides of the clamping frame, one end of each rotating supporting frame is rotationally connected with a first rotating shaft, each first rotating shaft is connected with a housing through an elastic telescopic structure, and each housing is connected with a pressing wheel through a second rotating shaft; and the torsion applying part comprises an outer shell fixedly connected with the rotating supporting frame, and a volute spiral spring is installed in the outer shell. The