The utility model provides a plate structure and a door plate, and relates to the technical field of plates, the plate structure comprises a top plate, a reinforcing structure and a bottom plate, the reinforcing structure is fixedly connected with the top plate; the bottom plate is fixedly connected with the end, away from the top plate, of the reinforcing structure. The reinforcing structure comprises a plurality of same composite boards, the composite boards are fixedly connected, and the composite boards are perpendicular to the top board and the bottom board respectively. The door plate comprises the plate structure. According to the plate structure, the multi-layer structure and the internal structure of the reinforcing structure are combined together, so that external loads can be dispersed and resisted more effectively, the overall firmness of the plate is improved, and the plate structure is suitable for various application scenes needing high-strength support.