Split type brake disc mounting hole measuring tool

The utility model relates to a split type brake disc mounting hole measuring tool, which comprises a ruler with scale marks, and is technically characterized in that the front end of the ruler is connected with a positioning seat, the center of the bottom surface of the positioning seat is provided with a positioning column, the lower part of the positioning column is provided with a diameter-expanding boss, and the diameter-expanding boss is connected with the scale marks. The outer circumferential face of the diameter-expanding boss is an arc face matched with a split type brake disc installation hole, supporting legs are arranged at the front end and the rear end of the bottom face of the positioning base respectively, the lower ends of the supporting legs are higher than the top face of the diameter-expanding boss, a sliding sleeve is arranged on the ruler, a vertical blocking piece is arranged on the lower surface of the sliding sleeve, and the diameter-expanding boss is arranged on the vertical blocking