The reaction sintered silicon carbide crucible sagger has the characteristics of large volume density, high temperature resistance, fast heat conductivity, acid and alkali corrosion resistance, high temperature strength, good stability, high oxidation resistance, long term repeated use of no deformation and no slags, the service life is several times or even tens oftimes of the general material, can be customized according to the user's different use environment of various specifications It has been widely used in non-ferrous metal smelting, sintering of various ceramic raw materials, high-grade porcelain, sintering of lithium batteries and other electronic materials, and other high-temperature sintering industries such as rare metal smelting