The invention discloses an Akt inhibitor intermediate SM1 and a preparation method thereof. The Akt inhibitor intermediate SM1 is obtained by reacting a compound IM1 with p-toluenesulfonic acid. The preparation method of the compound IM1 comprises the following steps: (1) reacting a compound 4 with a compound 9 under the actions of a pyrrolidine catalyst and benzoic acid, adding trifluoroacetic acid after reaction is finished, adding alkali after reaction is finished, and extracting to obtain a solution of a compound 10; (2) reacting the solution of the compound 10 with the trifluoroacetic acid and triethyl silicane, adding alkali after reaction is finished, extracting to obtain a solution of an intermediate, and reacting the intermediate with Boc anhydride under the effect of alkali to obtain a compound 11; and (3) under the effect of a reducing agent on the compound II, obtaining the compound IM1. The provided intermediate SM1 is solid, is convenient to weigh and convenient to store,and is easily refined, the shortcoming that in the prior art, IM1 is liquid and is difficult to refine is overcome, and a quality control standard of SM1 is easy to establish on production.