Concrete prefabricated square pile with connector

A concrete prefabricated square pile with connecting joints comprises a square pile body and is characterized in that connecting pipes which are the same as the square pile body in external shape and outer diameter are coaxially embedded in the two ends of the square pile body, end plates are welded to the ends of the connecting pipes for sealing, inwards-concave grooves are formed in the side faces of the connecting pipes in the radial direction, and the connecting joints are arranged in the grooves. The depth and the length of the groove are larger than the diameter and the length of the connector bolt, bolt holes are formed in the areas, where the groove is located, of the end plates, and the square pile body on the upper side and the square pile body on the lower side are connected and fixed through the connector bolt in the bolt holes. The requirement for the technical level of welding operators is reduced, the accident potential caused by an existing pile splicing pile head welding process is avoided, t