Positioning device for machining end face tooth with through shaft

The positioning device comprises a base, a supporting table and a guide seat, the top of the base is recessed to form a first mounting groove, the supporting table is vertically arranged at the bottom of the first mounting groove, a mounting rod is fixed to the top of the supporting table, the guide seat is detachably connected with the mounting rod through a mounting assembly, and the mounting assembly is detachably connected with the base. The guide seat is used for being inserted into an axis hole of an end face tooth and tightly attached to the inner wall of the axis hole, the supporting table is used for supporting the bottom of the end face tooth, second mounting grooves are formed in the two side walls of the base, and a clamping assembly used for clamping the end face tooth from the side wall of the end face tooth is arranged in each second mounting groove. The end face tooth clamping device solves the problems that in the prior art, an existing end face tooth clamping device is complex in clamping op