Building outer wall structure

The utility model discloses a building outer wall structure, which relates to the technical field of building outer walls and comprises an outer wall body, a reserved block is fixedly connected to the inner wall of the outer wall body, a threaded rod is rotatably connected to the inner surface of the outer wall body, and a decorative layer is slidably connected to the outer surface of the threaded rod. The outer surface of the threaded rod is in threaded connection with a nut, the outer surface of the nut is fixedly connected with the outer surface of the decorative layer, and a reinforcing mechanism is arranged outside the threaded rod. The external wall reinforcing structure is reasonable in design structure, the reinforcing mechanism, the reserved block, the external wall body, the threaded rod and the square block are matched, the threaded rod can push the square block to move when rotating, then the square block extrudes the reinforcing mechanism, the reinforcing mechanism can make contact with the reser