Step milling cutter disc

The step milling cutter disc comprises a cutter disc body, cutting teeth, a clamping disc and blades, the cutter disc body comprises a first cutter disc body and a second cutter disc body, the diameter of the second cutter disc body is larger than that of the first cutter disc body, the first cutter disc body and the clamping disc body are fixedly arranged on the front end face and the rear end face of the second cutter disc body respectively, and the first cutter disc body, the second cutter disc body and the clamping disc body are concentrically arranged and integrally formed; the first cutter head and the second cutter head are provided with a plurality of cutting teeth along the outer circumference, each cutting tooth is fixedly provided with a blade, a circle of chamfering cutting part is arranged at the joint of the first cutter head and the second cutter head, the chamfering cutting part comprises a plurality of chamfering tool aprons which are distributed around the axis at equal angles, and the gradi