The invention belongs to the field of cutting a prefabricated pipe pile off, and discloses a cutting-off construction method for the prefabricated pipe pile. A construction tool comprises a profile cutting machine, a suspension shaft, a roller and an annular rail, wherein the roller is arranged in a rail groove formed in the outer circumferential wall of the annular rail, the top of the cutting machine is hinged to one end of the suspension shaft, and the other end of the suspension shaft is connected with a roller rotating shaft; and an operation handle and a cutting disc are arranged at the bottom of the cutting machine, wherein the cutting disc is perpendicular to the axis of the prefabricated tube pile. According to the cutting construction method, firstly, the cutting-off position is subjected to elevation calculation and measurement, so that the rail installation position is determined; secondly, the annular rail is arranged on the prefabricated pipe pile in a surrounding mode and is fixed; then the cutting disc is installed and is perpendicular to the axis of the pipe pile, and the cutting edge is flush with the cutting-off position; and finally the cutting machine is started and pushed to do circular motion around the pipe pile and move in the radial direction by taking the top hinge point as the circle center, simultaneous cutting and walking are realized, and cutting is completed after the cutting machine rotates by one circle. The cutting-off construction method has the advantages that the construction is simple and fast, the production efficiency is high, the construction quality is guaranteed, the labor intensity is reduced, and the safety and environment friendliness are higher.