The invention relates to a method for manufacturing a light steel truss reinforced structure. The light steel truss reinforced structure manufacturing method adopts the following light steel truss reinforced structure manufacturing device. The light steel truss reinforced structure manufacturing device includes a connecting plate, a rotating plate, an adjustment mechanism, A rebound rod, a telescopic spring, a pressure plate and a mounting mechanism; a method for manufacturing a light steel truss reinforcement structure using the above-mentioned light steel truss reinforcement structure manufacturing device, including the following steps: S1, adjusting the angle of the rotating plate; S2, positioning the pressure plate; S3, placing the steel truss; S4, adjusting the angle of the steel truss; S5, locking the steel truss. The present invention can solve the problem existing in placing and locking the steel truss: the position of the steel truss on the left and right sides is asymmetrical due to the artificial placement of the steel truss, resulting in poor stability of the steel structure; when the steel truss is welded It is easy to cause its misalignment, so that there is a certain deviation between the locking angle of the steel truss and the design angle.