Floor board construction structure for building

The utility model discloses a floor board construction structure for a building. The floor board construction structure comprises floor boards, a steel beam and fixing assemblies. Each floor board comprises a structure portion, a left combination portion and a right combination portion, wherein the left combination portion and the right combination portion correspond to each other. Every two adjacent floor boards can be in mutual lap joint with each other to be combined through the corresponding combination portions, so that the structural portions are formed. Each floor board is provided with a flat board portion. The steel beam is arranged at the tail ends of the floor boards. Each fixing assembly can be in an L shape, one end of the fixing assembly is fixed to the structural portion of the corresponding floor board, so that an opening of the structural portion is covered through the fixing assembly, and the other end of the fixing assembly can be welded to the steel beam. According to the floor board construction structure, the portions arranged above the steel beam, of the floor boards are fixed through the fixing assemblies, all kinds of construction can be conveniently conducted on the floor boards, the opening portions of the floor boards are closed, so that other construction engineering is facilitated, the structural strength of the building is improved, and the floor board construction structure meets the requirements for environmental friendliness and energy conservation.