The invention provides a preparation method of a rubber vulcanizing accelerator CBBS and relates to the technical field of rubber vulcanizing accelerators. According to the preparation method, 2-mercaptobenzothiazole and cyclohexylamine are subjected to an oxidation catalysis reaction under the action of a catalyst and a surfactant under the constant temperature and constant pressure condition with oxygen as an oxidizing agent, cancerogenic substance nitrosamine cannot be produced in the reaction process, and the method has the advantages of being green and environmentally friendly. Green andcheap oxygen is adopted as the oxidizing agent in the method, the production cost is low, the method is very economical, and the problems that preparation processes are complex, a large quantity of raw and auxiliary materials are used and wastes produced during preparation contain a large number of environmental pollutants and severely pollute the environment in existing production methods of CBBSrubber additives are effectively solved.