The invention provides a vacuum insulation plate core material. The vacuum insulation plate core material comprises a mineral wool plate, and the density of the mineral wool plate is 250-300 Kg/m<3>.The invention further provides a preparation method of the vacuum insulation plate core material and a vacuum insulation plate which comprises the vacuum insulation plate core material. According to the vacuum insulation plate core material, waste recycle is promoted, the production cost of the vacuum insulation plate core material is remarkably lowered, and the vacuum insulation plate core material has good fireproof performance and can be economically and effectively applied to the field of production of mobile board rooms.