The invention discloses a liquid-phase circulation preparation method for 2-(4-bromomethylphenyl)propionic acid. The liquid-phase circulation preparation method comprises the following steps: feedinghydrobromic acid, paraformaldehyde, 2-phenylpropionic acid, a solvent and a Lewis acid catalyst in a bromoethylation reactor as reaction materials; adding water into a hydrogen bromide gas generator,adding phosphorus tribromide drop by drop, and allowing generated hydrogen bromide gas to pass through a buffer device and then to enter the bromoethylation reactor; heating the bromoethylation reactor to 60-80 DEG C, conveying a liquid phase in the reactor to a spray thrower through a liquid-phase circulation pump, spraying the liquid phase into a filler by the spray thrower so as to allow the liquid phase and the hydrogen bromide gas to fully contact in the filler, and carrying out reaction-absorption to achieve liquid-phase circulation; and after a reaction is completed, subjecting a reaction liquid in the bromoethylation reactor to post-treatment so as to obtain 2-(4-bromomethylphenyl)propionic acid. The method has the advantages of small amount of waste gas, waste water and industrialresidues, low cost and environment friendliness when applied to preparation of 2-(4-bromomethylphenyl)propionic acid.