In order to improve the quality of carbide blade edge passivation and overcome the shortcomings of existing passivation method, based on material removal theory under the action of abrasive water jet, the mechanism of material removal of abrasive water jet on carbide blade edge passivation was analyzed.A new method of using abrasive water jet for passivation of carbide blade edge was proposed, and the feasibility of the method was verified through theoretical analysis and experimental test. The application of this method improved the efficiency of carbide cutting tools, quality and life, and ensured the consistency of the parameters of the blade passivation. Good results are achieved, which have a great significance to carbide blade edge passivation. 