The invention belongs to the technical field of the petroleum and natural gas borehole operation site, which is an efficient method for fixing a relief line screw anchor on the ground of the petroleum and natural gas site, exactly a relief line anchoring method. The method mainly involves a stable triangular bracket structure consisting of a base, a hanger and a bracket and a rotation system consisting of a chain block, a pair of hydraulic tubing tongs and a line screw anchor; and the hydraulic power of a well dredger drives the hydraulic tubing tongs to screw the line screw anchor in or out of the ground. The invention provides the relief line anchoring method, which is easy to operate at site and saves time and labor.