Composite fireproof board and method of processing and preparing the same

A composite fireproof board comprising a structure, the structure comprising, from bottom to top, a bottom layer, a lower reinforcement mesh layer, a middle layer, an upper reinforcement mesh layer, and a surface layer, wherein the middle layer comprises a frame and an inorganic fireproof material filled within the frame, the frame is made of an organic material, the frame comprises a plurality of first spaced apart edges and a plurality of second spaced apart edges, the second spaced apart edges extend between the first spaced apart edges to define the frame, one of (i) each of the plurality of first edges and (ii) each of the plurality of second edges including second edge grooves, and the other of (i) each of the plurality of first edges and (ii) each of the plurality of second edges including bulges corresponding to the grooves, the grooves and the bulges located only at joints between the plurality of first edges and the plurality of second edges, the plurality of first edges and the plurality of second edges are fixedly connected through the grooves and the bulges, and the frame includes fixed grooves on edges of each of the plurality of first edges adjacent to the inorganic fireproof material and at least one through hole, wherein the inorganic fireproof material is filled within the fixed grooves and the at least one through hole.