The silicon carbide graphite composite crucible uses high-quality silicon carbide and high-purity graphite as the main raw materials, and has characteristics such as high temperature resistance, oxidation resistance, corrosion resistance, high strength, and thermal shock resistance; Good thermal conductivity, non polluting negative electrode materials, good airtightness, and can be used for negative electrode material coating carbonization process, which is conducive to controlling the volatilization and specific surface area of negative electrode materials.