Steel structure externally-hung wallboard

The utility model discloses a steel structure externally-hung wallboard, and relates to the technical field of fabricated building wallboards, the steel structure externally-hung wallboard comprises two wallboard bodies, the left sides of the two wallboard bodies are fixedly connected with C-shaped plates, and the right sides of the two wallboard bodies are provided with C-shaped grooves; the side face of the C-shaped plate on the left side is slidably connected with the side face of the inner wall of the C-shaped groove on the right side, sliding grooves are formed in the front side and the rear side of the wallboard body, L-shaped strips are slidably connected to the side faces of the inner walls of the sliding grooves, and first compression springs are fixedly connected to the left sides of vertical strips of the L-shaped strips. An L-shaped strip moves leftwards, two cross-shaped blocks are closed towards the middle and move to the side face of the inner wall of a T-shaped groove, the two cross-shaped blo