The invention provides a casting mold plate device capable of easily and conveniently disassembling and demolding. The casting mold plate device capable of easily and conveniently disassembling and demolding comprises horizontal plates and vertical plates, a plurality of first connecting blocks, a plurality of second connecting blocks, and auxiliary plates, wherein the multiple first connecting blocks are evenly arranged on the two sides of the horizontal plates; the multiple second connecting blocks are evenly arranged on one sides of the vertical plates and the other sides of the vertical plates; and the right sides of the auxiliary plates are fixed to left threaded rods of the vertical plates, and the threaded rods are arranged on the left sides of the auxiliary plates. According to thecasting mold plate device capable of easily and conveniently disassembling and demolding, the accuracy of rotation of the threaded rods is improved, disassembly and assembly of mold plates are more convenient and lightweight, meanwhile, a great deal of labor force is saved, operation is easy and convenient, stability of movement and installation of the mold plates is improved, tidiness and stability of casting are ensured, thus disassembly of the mold plates is programmed, stability of the mold plates after being installed is ensured, and meanwhile, the convenience of removal of the mold plates is improved.