The invention discloses a prefabricated pile and a preparation method thereof. The prefabricated pile comprises a pile body and a reinforcement cage, end plates are arranged at the two ends of the pile body, a plurality of connecting barrels vertically penetrate through the end plates, the two ends of the reinforcement cage are connected with the end plates through the connecting barrels, the connecting barrels are filled with colloid in a sealed manner, and the reinforcement cage is made of a fiber material; and the preparation method comprises the steps that (1) a pile body skeleton is prepared; (2) pouring of concrete and mold closing centrifugal treatment are carried out; and (3) prestressing force is applied. The prefabricated pile and the preparation method can effectively solve technical problems such as insufficient flexural capacity and failure to apply in corrosive environment, are environmentally friendly, and accord with sustainable development.