The invention discloses a preparation method for a mercaptan oxidation catalyst. The method includes contacting a metal phthalocyanine solution with a porous carrier and performing drying, wherein the metal phthalocyanine solution contains dissolved metal phthalocyanine, an organic alkaline nitride and water, and the organic alkaline nitride is one of an alcohol amine compound, a hydrazine compound, a urea compound and a guanidine compound or a mixture of over two of them. According to the method provided by the invention, the metal phthalocyanine active component on the prepared catalyst can be evenly dispersed and firmly loaded, and is difficult to run away, so that the catalyst can have good activity and stability when it is used for mercaptan oxidation or hydrocarbon oil deodorization. In addition, the process of the metal phthalocyanine type mercaptan oxidation catalyst is a simple, environment friendly and low-cost ex-situ preparation method.