Rapid positioning tool for cross shaft

The utility model relates to the technical field of tool clamps, and discloses a rapid positioning tool for a cross shaft, which comprises a bottom plate, two parallel side plates are fixed on the bottom plate, a positioning seat is fixed between the upper ends of the side plates, a positioning groove is arranged on the top surface of the positioning seat, the cross section of the bottom surface of the positioning groove is of a V-shaped structure, and the cross section of the bottom surface of the positioning groove is of a V-shaped structure. A positioning through hole perpendicular to the bottom plate is formed in the center of the positioning groove; two parallel sliding rods are arranged between the two side plates and located on the lower side of the positioning seat, two clamping assemblies are arranged between the sliding rods and are in sliding connection with the sliding rods, a screw rod is arranged between the lower ends of the two side plates, two sections of threads with opposite screwing direct