Tool and method for measuring thickness of disc with inclined wall thickness on given diameter

The invention discloses a tool for measuring the thickness of a disc with the wall thickness having an inclined angle on a given diameter, and the tool comprises a main body, a fixed bearing frame, a micrometer dial gauge, a movable bearing frame, and a ball head measuring pin, and the main body comprises a Y-shaped frame disposed on the outer circle of the disc in a crossing manner, and a storage groove disposed in the middle of the Y-shaped frame. The fixed supporting frame and the movable supporting frame are arranged on the two sides of the body respectively, a fixing unit used for fixing the position of the movable supporting frame when the movable supporting frame is contained in the containing groove is arranged in the containing groove, the micrometer dial gauge is arranged at the free end of the movable supporting frame, and the ball head measuring pin is arranged at the tail end of the fixed supporting frame. The ball head of the ball head measuring pin and the gauge head of the micrometer gauge are