Green and environmental-friendly wallboard mounting structure and mounting method

The invention relates to a green and environmental-friendly wallboard mounting structure which comprises a prefabricated wall, wherein the prefabricated wall comprises a plurality of prefabricated inner boards and a plurality of prefabricated outer boards, a supporting assembly is arranged between the adjacent two prefabricated inner boards and comprises a supporting column and two wing plates, the supporting column is located between the adjacent two prefabricated inner boards, the prefabricated outer boards are uniformly distributed on two sides of the thickness directions of the prefabricated inner boards separately, and two ends of the prefabricated outer boards in the length directions are separately attached to the adjacent two prefabricated inner boards. The wing plates are T-shaped, and avoidance grooves where the wing plates are inserted are formed in the sides, close to the direction toward the prefabricated inner boards, of the prefabricated outer boards. The green and environmental-friendly wallbo