Positioning tool for punching gear shaft

The utility model relates to the technical field of gear shaft positioning tools, in particular to a positioning tool for punching a gear shaft, which comprises a workbench, a fixed support is arranged on the workbench, and a movable support is arranged at the upper end of the fixed support. The fixed support is composed of main vertical plates which are symmetrical left and right, and first clamping sets which horizontally penetrate through the two main vertical plates are arranged in the two main vertical plates. The movable support is composed of auxiliary vertical plates which are in bilateral symmetry, and second clamping sets which are horizontally inserted into the two auxiliary vertical plates in a penetrating mode are arranged in the two auxiliary vertical plates. A sleeve which extends along the upper end in the fixed support and is communicated with the outside is arranged in the fixed support, and a guide column accommodated in the sleeve is arranged at the lower end of the movable support; the up