Moisture-proof heat preservation type medium-high density fiberboard

The utility model discloses a moistureproof heat preservation type medium-high density fiberboard, which comprises a board body and a screw, a nail fixing structure is arranged in the board body, the nail fixing structure comprises a T-shaped groove, the T-shaped groove is arranged in the board body, a support frame is fixed in the T-shaped groove, the outer wall of the support frame is attached to the inner wall of the T-shaped groove, and the outer wall of the support frame is attached to the inner wall of the T-shaped groove. A connecting nut is arranged on one side of the interior of the supporting frame, the screw is matched with the connecting nut, a connecting cylinder is connected to one side of the connecting nut, a nut head of the connecting nut and the connecting cylinder are both of a rectangular structure, and the connecting nut and the connecting cylinder are of an integrally-formed structure, so that the screw supports repeated disassembly and assembly; meanwhile, the stress limit of the board