Construction method of large-span folded plate type steel roof truss

The invention relates to a construction method of a large-span folded plate type steel roof truss. A roof truss support, a plurality of V-shaped steel frame units, a plurality of inverted-V-shaped steel frame units and an aerial scattered assembly unit form a whole roof steel frame in a folded plate shape. The construction method is characterized in that the V-shaped steel frame units and the inverted-V-shaped steel frame units are machined on the ground, the inverted-V-shaped steel frame units and the V-shaped steel frame units are integrally hoisted, and the aerial scattered assembly unit is hoisted; and an air assembly technology is carried out between the inverted-V-shaped steel frame unit and the V-shaped steel frame unit by utilizing the aerial scattered assembly unit. The construction method has the advantages that the technical problems of speed, precision, deformation and the like of ground assembly and aerial in-place measurement are solved, and the mounting precision, quality and safety of a steel