Fabricated wallboard system and mounting method

The invention discloses a fabricated wallboard system and a mounting method, the fabricated wallboard system comprises a mounting structure and wallboards, and the wallboards are spliced along the horizontal and vertical directions and fixed on a building facade through the mounting structure. During installation, the installation structure is firstly fixed on a wall surface, the keel is fixed on a building facade through the keel installation assembly, the connecting piece is fixed on the keel, a hanging rod installation hole is formed in the connecting piece, and the hanging rod penetrates through the installation hole and then is hung on the connecting piece; and then a screw penetrates through the wallboard connecting piece and is screwed into the wallboard, so that the connection between the wallboard connecting piece and the wallboard is completed, and then the wallboard connecting piece is hung on the hanging rod. The positions of the wallboards in the fabricated wallboard system can be adjusted three-