The box type vacuum furnace uses silicon carbide rod or 0cr27al7mo2 high temperature alloy resistance wire as heating element. The furnace is made of polycrystalline fiber material. The double-layer furnace shell is equipped with air cooling system, which can quickly raise and lower the temperature. It can reach 1000 ℃ in 20 minutes. The inner tank is made of heat-resistant stainless steel 310S, which has good sealing performance. It can be vacuumized in advance. The cover plate is sealed with silicon rubber sealing ring, and the furnace door has water cooling system The furnace has the advantages of balanced temperature field, low surface temperature, fast temperature rising and falling rate, energy saving, clean furnace and not easy to be polluted. It is used for atmosphere protection sintering and atmosphere reduction in universities, scientific research institutes and industrial and mining enterprises.