The invention discloses a granite decorative board, which comprises a decorative board body, connecting grooves are arranged on both sides of the decorative board body, a vermiculite board is arranged near the connecting groove on the decorative board body, the vermiculite board is vertically installed on the decorative board body, and the vermiculite There are two stone slabs, a coating layer is connected between the two vermiculite slabs, and an insulation board is installed on the lower surface of the coating layer. The thickness of the insulation board is greater than the thickness of the coating layer. There is a foamed cement slab, and the foamed cement slab is flexibly connected to the main body of the decorative board, and a steel connecting column is installed between the foamed cement slab and the decorative board body, there are two steel connecting columns, and the top of the steel connecting column Extends within the insulation board. The granite decorative board is light in weight, easy to carry, has good fireproof performance, can avoid brittle cracking at the same time, and can effectively prevent the plate from arching and deformation, ensuring that the shrinkage joint gap of the plate is small, the overall is more reasonable, and the decorative effect is more obvious .