A synthetic method of the all trans long chain terpene primary alcohol is provided, which belongs to the technology field of the organic synthesis. The invention uses the cheap and easily gained geraniol, 2-allylic alcohol or the long chain terpene primary alcohol synthesized by the method as initial materials and uses the ethylenic chlorination reaction happened between the terpene primary alcohol acetate and the lime chlorite to form double bonds and the coupling reaction between the benzene sulphinate ester and the allyl chloride under alkali condition as the key steps, and gain the products through the hydrolysis reaction of the benzene removal sulphinate group and ester of the coupling product. The invention fully utilizes the complete framework of the primary alcohol and adds one ora plurality of isopentene units via coupling and synthesizes series of long chain terpene primary alcohol, which fully embodies the synthesis conception of the atomic economy; only a novel double bonds is formed in the reaction and other double bonds are the all trans double bonds in the raw materials, thereby ensures the trans configuration of the double bonds in the generated long chain terpeneprimary alcohol to the greatest extent. The invention has moderate reaction condition, simple synthetic route, simple operation, good reaction selectivity, high productive rate, easy separation and purification of the products and small environmental pollution.