The invention discloses a preparation method of 4-benzyloxy phenyl ethyl n-decanoate, which comprises the following steps: A, adding 
methanol, p-hydroxyphenethyl 
alcohol and equivalent 
benzyl chloride into a clean three-neck flask, uniformly stirring and mixing, then adding 
sodium hydroxide solid in three batches, heating to 
reflux after each time of addition, and reacting for 0.5 hour, so as to obtain 4-benzyloxy phenyl ethyl n-decanoate; b, after the reaction is finished, directly distilling out the 
solvent, then after the 
solvent is completely distilled, directly dropwise adding n-decanoyl 
chloride with the same equivalent amount, and controlling the temperature to be lower than 20 DEG C, C, after the reaction is finished, adding a large amount of water, separating out a large amount of product at the moment, uniformly stirring, and centrifuging to obtain a crude product; and D, adding 
ethanol into the crude product, heating and dissolving, cooling and separating out, and centrifuging again to obtain a refined product 4-benzyloxy phenyl ethyl n-decanoate. In the reaction stage, the usage amount of solvents and reagents is reduced, no acid-binding agent is used, and therefore 
pollution to the environment is reduced, no by-product exists in the reaction process, and the production process is more 
environmentally friendly.