The invention discloses a steel reinforcement framework seam welder, a steel reinforcement framework manufacturing method and a square pile manufacturing method. The seam welder comprises a fixed rotating electrode mechanism, a fixed immovable electrode mechanism and a pulling frame. The fixed immovable electrode mechanism is disposed below the fixed rotating electrode mechanism and used for performing welding positioning on non-prestressed main reinforcements and performing isolation guiding on steel strands. The pulling frame is disposed in rear of the fixed immovable electrode mechanism and used for pulling the non-prestressed main reinforcements and the steel strands. The manufacturing method of the steel reinforcement framework includes the step that the steel strands are synchronously pulled while welding positioning is performed on the non-prestressed main reinforcements and reinforcement stirrups through the seam welder. The method for manufacturing a prestressed concrete square pile includes the steps of manufacturing the steel reinforcement framework, tensioning the steel strands, pouring concrete, performing curing and paying off and tensioning the steel strands. The steel reinforcement framework and the square pile are conveniently and rapidly manufactured through the seam welder in the invention, and the production efficiency is high.