It is made of magnesia material as the main raw material, with high specific heat materials and various binders added, after full pre mixing, high pressure molding, and high temperature drying. The product has the characteristics of high specific heat capacity, high density, high thermal conductivity, and high insulation, and has good volume stability under high temperature, without harmful volatile substances, ensuring that the heat storage equipment has the characteristics of high electrical safety, large heat storage capacity, good heat release, small size, and environmental protection during use. It is an ideal solid heat storage material for thermal storage electric heaters and thermal storage boilers.