The invention relates to a tazobactam synthesis method which comprises the steps of: with 6-APA(Amino Penicillanic Acid) as raw material, preparing a key intermediate 6,6-dihydro penam sulphoxide acid diphenylcarbinol ester through successive reactions of esterification, oxidation, reduetive debromination and the like without separation; then, reacting with 2-triphenyl silicon-1,2,3-triazole; introducing a triazole ring; and finally obtaining the final product of tazobactam through potassium permanganate oxidation and metacresol deprotection. The tazobactam synthesis method is mainly characterized in that a phase transfer catalyst is introduced in the first step, therefore, the reaction rate and the product purity are improved; since an environment-friendly hydrogen peroxide-cobalt acetate catalytic oxidation system is adopted in the third step, the characteristics of good reaction selectivity, high yield, catalyst recyclability and the like are achieved; a method for synthesizing 2 alpha-methyl-2 beta-(1,2,3- triazole-1- radical) methyl penam-3 alpha-carboxylic acid diphenylcarbinol ester by using 2-triphenyl silicon-1,2,3-triazole is adopted in the fifth step, and the tazobactamsynthesis method is simple and convenient to operate, is safe and reliable, shortens the reaction route and improves the total yield. Compared with the traditional process, the tazobactam synthesis method greatly reduces the production cost and the environment pollution and has greater implementation value and economic benefits.