The invention discloses a novel method used for synthesizing cholesterol. The novel method comprises following steps: 1, stigmasterol 02 is dissolved in an organic solvent I, and is subjected to silicon etherification reaction with trimethylchlorosilane under the effect of a catalyst, and a compound 03 is obtained via water washing and condensation; 2, the compound 03 is dissolved in an organic solvent II for ozone oxidation, zinc powder and acetate acid gracial are added for reduction, after reduction, filtering, washing, and condensation are carried out so as to obtain a compound 04; 3, triphenylphosphine is reacted with 1-halogenated-3-methyl butane so as to obtain 3-methyl butyl triphenyl halogenated phosphorus, the 3-methyl butyl triphenyl halogenated phosphorus is added into an aprotic solvent, a strong base is added, wittig reaction with a compound 4 is carried out, and neutralizing, condensation, and filtering are carried out so as to obtain a compound 05; 4, the compound 05 is subjected to selective hydrogenation in a solvent III under the action of a catalyst and a passivator, and filtering, condensation, and crystallization are carried out so as to obtain cholesterol 01. The novel method is simple; raw materials are cheap; the novel method is economic and is friendly to the environment, and is convenient for industrialized production.