The present invention discloses a novel method for chemically synthesizing pristane with isophytol as a starting material. Isophytol is used, and pristane is prepared through oxidation, a methyl Grignard reaction, sulfonylation, halogenation and reduction. The method in the present invention, as compared with the conventional synthesizing method, adopts cheap raw materials, avoids high pressure hydrogenation reactions, and solves the problems of methyl migration caused by a dehydration reaction or isomerization caused by cyclization in the conventional synthesizing method. The method of the present invention is suitable for industrial production of pristane.