The invention discloses a preparation method for dihydrosafrole. Piperidine and propionyl chloride are used as initial raw materials, and the preparation method comprises the following steps of: 1) acylation reaction of Friedel-crafts of the piperidine: reacting the piperidine and the propionyl chloride in a solvent I under the catalytic action of a lewis acid catalyst, adding iced water after finishing the reaction, standing, separating phases, washing an organic phase in the lower layer and distilling the solvent I to obtain piperonyl ethyl ketone; and 2) reduction reaction of Wolff-Kishner-Huang-min-lon of the piperonyl ethyl ketone: refluxing the piperonyl ethyl ketone and hydrazine hydrate solution at the mass concentration of 80 to 90 percent in a solvent II for hydrazone reaction, and adding polyethyleneglycol-400 and potassium hydroxide and performing hydrazone decomposing reaction to obtain the dihydrosafrole. The method for preparing the dihydrosafrole has the characteristics of high product yield rate, mild process condition, simple operation and the like.