The invention discloses a method for preparing N-cyclohexyl-2-benzothiazole sulfonamide serving as a rubber vulcanization accelerator. The method comprises the following steps: firstly, adding water or mother liquor into a reaction kettle, recycling cyclohexane, stirring and heating; then, adding dibenzothiazyl disulfide and cyclohexane, continually stirring and heating, dropwise adding hydrogen peroxide and sodium hypochlorite in sequence after heating, and performing an oxidization reaction after finishing dropwise adding; separating solid from liquid after finishing the reaction; recycling a part of the mother liquid after separation, distilling the remaining part of mother liquor to obtain distillate, and recycling cyclohexane; washing, filtering and drying the obtained solid in sequence to obtain the N-cyclohexyl-2-benzothiazole sulfonamide serving as the rubber vulcanization accelerator. The method has the advantages of short reaction time, easiness in judging a final point, good product quality, production of a small amount of waste water, and contribution to environmental protection.