Assembling mold and assembling method for steel plate net structure prefabricated composite wall plate

The invention discloses an assembling mold and an assembling method for a steel plate net structure prefabricated composite wallboard. The mold comprises an I-shaped template, an II-shaped template, a corner connecting piece and a three-way connecting piece, and the left side and the right side of the I-shaped template are provided with inserting parts protruding outwards in the height direction of the I-shaped template; grooves matched with the inserting parts are formed in the left side and the right side of the II-shaped template; the end face of the corner connecting piece is of a square structure, inserting parts protruding outwards are arranged on the two adjacent side edges of the square, the end face of the three-way connecting piece is of a square structure, inserting parts protruding outwards are arranged on the three side edges of the square, and the inserting parts on the corner connecting piece and the inserting parts on the three-way connecting piece are arranged in the height direction of the c