The invention provides a preparation method for a health product resveratrol. According to the invention, 1, a deprotection method used in the invention is green, environment-friendly and pollution-free, the preparation method is almost free of production of waste gas, waste water and industrial residues, and the product 1,4-pentadiene has economic value; 2, a catalyst used in the invention has good cycle repeatability and can be cyclically used 50 times or more; 3, the preparation method is simple in operation requirements, mild in reaction conditions, good in specificity, simple in post-treatment and purification of the product, and suitable for industrial production; and 4, the resveratrol prepared by using the method is free of impurity and has high purity.