Measuring gauge for spline shaft

A measuring gauge for a spline shaft comprises a base, a lower floating tip is arranged in the middle of the base, and an upper tip is located above the lower floating tip. A stand column is arranged on the base, a large diameter measuring device, a small diameter measuring device and a height measuring device are arranged on the stand column, the small diameter measuring device is located above the large diameter measuring device, and the height measuring device is located between the small diameter measuring device and the large diameter measuring device; and an inner diameter measuring device is arranged on the base. The measuring gauge for the spline shaft is simple in structure and convenient to operate, the spline shaft is fixed through the lower floating tip and the upper tip, and then the major diameter, the minor diameter, the boss height and the inner diameter of a bottom hole of the spline shaft are measured through the major diameter measuring sensor, the minor diameter measuring sensor, the heigh