Positioning device for marking garment trouser cut-parts

The positioning device comprises a workbench, supporting legs are fixedly connected to the four corners of the lower end of the workbench, T-shaped grooves are formed in the left portion of the upper end of the workbench and the right portion of the upper end of the workbench, T-shaped sliding blocks are connected into the two T-shaped grooves in a sliding mode, the two T-shaped sliding blocks are jointly connected with a second pressing plate in a sliding mode, and the second pressing plate is connected with a third pressing plate in a sliding mode. A first pressing plate is movably connected to the rear end of the second pressing plate in a penetrating mode, a plurality of rear auxiliary pressing plates are movably connected to the rear end of the first pressing plate, a plurality of front auxiliary pressing plates are movably connected to the front end of the second pressing plate, and the front auxiliary pressing plates and the rear auxiliary pressing plates are the same in structure. The positioning devi