The utility model relates to the field of building material prefabricated wallboards. The utility model provides a novel assembly type steel structure wallboard. The structure comprises a steel structure outer frame body and an assembly part, the steel structure outer frame body is of a rectangular frame structure. the adjacent steel structure outer frame bodies are connected and fixed through assembly parts; fixing through holes are formed in the four corners of a steel structure outer frame body. A light steel keel piece is arranged in the steel structure outer frame body frame. a concrete mortar layer, an anti-cracking gauze layer, a sound insulation and heat preservation layer and a decorative coating layer are sequentially arranged on each of the two sides of the light steel keel piece from inside to outside; the assembly part is composed of a square sheet body and threaded rods which are located at the four corners of the same side face and matched with the fixing through holes,the threaded rods are perpendicular to the square sheet body and are symmetrically arranged, and the other ends of the threaded rods penetrate through the fixing through holes to be provided with fixing nuts. The beneficial effects of the utility model are that: structural strength is high, installation is stable during the assembly and is not easy to fall off.