The invention belongs to the technical field of cutter manufacturing, and particularly relates to a cutting edge treatment method. In order to solve the problem that when imported high-quality steel is adopted to manufacture a cutter so as to improve the cutting edge performance of the cutter at present, the manufacturing cost of the cutter is high, the invention discloses the cutting edge treatment method. The cutting edge treatment method specifically comprises the following steps that S1, manufacturing preparation of a cutter is carried out, and the cutting edge part is cleaned; S2, a welding and laser cladding combined mode is adopted for machining a cutting edge strengthened layer; and S3, the cutting edge strengthened layer is coped, and final cutting edges are obtained. When the cutting edge treatment method is adopted for cutting edge treatment, not only can the performance of the cutting edges be greatly improved, the use effect of the cutter is guaranteed, but also the requirements for cutter body materials can be reduced, and the cost of the cutter is reduced.