The present invention discloses an apparatus and a method for preparation of C14 aldehyde by continuous hydrolysis of alpha, beta-epoxy carboxylate, the method is as follows: (1) an organic solvent and an alpha, beta-epoxy carboxylate solution are uniformly mixed in a dosing container to obtain a raw material mixture solution; (2) the raw material mixture solution is continuously outputted into the upper portion of a tower bottom layered segment, a raw material lye is preheated by a preheater, then the lower portion of a tower top layered segment, the raw material mixture solution continuously enters a middle hydrolysis segment under the buoyancy effect, and the lye continuously enters the middle hydrolysis segment under the gravity effect; and (3) the hydrolysis reaction of the alpha, beta-epoxy carboxylate is carried out in the countercurrent contact process of the lye and the alpha, beta-epoxy carboxylate, after completion of the reaction, waste lye collected from a tower bottom and a light phase collected from a tower top are post-processed separately. The method uses the continuous hydrolysis process to improve the yield and reduce the rate of waste materials and wastewater quantity.