The invention provides a method for synthesizing 3-substituted 3-vinyl-2-hydroxy-1-aryl acetone, and the reaction route is shown as follows: (please see the formula in the description), wherein Ar is phenyl, thienyl or substituted phenyl; R is methyl, phenyl, furyl or substituted phenyl. Compared with the existing allyl synthesis of alpha position of hydroxyketone, the synthetic method has the advantages of having hydroxyl group, requiring no protection, and being good in the substrate applicability, mild in the reaction conditions, simple in operation and low in the synthetic cost, and stereo divergent synthesis of 3-substituted 3-vinyl-2-hydroxy-1-aryl acetone with continuous chiral centers can be achieved only through one-step reaction, namely, any one of the four spatial configurations of the product is synthesized according to the need. The product can be directly applied to the selectivity synthesis of the broad-spectrum inhibitor hinokiresinol medicine, and reduce the original process.