Moistureproof gypsum board and preparation method thereof

The invention provides a moisture-proof gypsum board which comprises a gypsum board body, a limiting groove, a U-shaped clamping plate, a sealing gasket and a gap sealing piece, the limiting groove is formed in the position, close to the edge, of the side wall of the gypsum board body, and the U-shaped clamping plate is clamped on the side edge of the gypsum board body; sealing gaskets clamped with the limiting grooves are arranged on the inner side walls of the U-shaped clamping plates, and gap sealing pieces are arranged at the junction positions of the U-shaped clamping plates. The gypsum board has the advantages that the limiting groove is formed in the gypsum board body, the U-shaped clamping plate is arranged on the side edge of the gypsum board body, and the sealing gasket connected with the limiting groove is arranged on the U-shaped clamping plate, so that on one hand, the edge position of the gypsum board body can be protected, and the edge position of the gypsum board body is not prone to damage; o