The invention relates to a prefabricated drainage bamboo pile and a preparation method thereof, and belongs to the technical field of construction. The prefabricated drainage bamboo pile includes interconnected pile caps, prefabricated reinforced concrete pile cores, pile tips, pile tip metal protection heads, waterproofing layers, prefabricated permeable concrete pipes, drainage pipes, prefabricated metal filters, and geotextile filter layers; the prefabricated reinforced concrete pile cores are cylindrical and connected with the pile tips as a unitary member, each pile tip is composed of a pile tip cylindrical section and a pile tip conical section, the surface of the pile tip conical section is provided with a pile tip metal protection head, the prefabricated permeable concrete pipes are hollow cylindrical shapes, the surface of the prefabricated permeable concrete pipes are provided with annular bamboo segments at equal intervals along the vertical direction of the pile body, and aprefabricated metal filter is arranged between the two annular bamboo segments; a metal filter is semicircular and annular, a filter hole is formed in the surface of the metal filter, and a geotextile filter layer is arranged on the outer surface of the metal filter. The prefabricated drainage bamboo pile has the advantages of high assembly degree, convenient assembly, a bearing function of the pile body is combined with a drainage function, the damage of the pile tip is avoided, the drainage of the pile body is easy to block, and the drainage pipe is single.