It is used for continuous sintering production of rare earth materials, refractories, ceramics, electronic materials, etc. under ultra-high temperature, nitrogen or argon atmosphere. At present, the temperature of traditional continuous tunnel furnace can only reach 1600℃, which cannot complete the ultra-high temperature sintering of some materials. This product is developed to expand the range of maximum sintering temperature and carry out continuous production, which can be used for continuous sintering of special materials up to 2200℃.