▎ 摘　　要

NOVELTY - The invention claims a high temperature tubular furnace for preparing graphene, comprising a furnace body; a furnace cover and a furnace pipe; two side walls of the furnace body are provided with a square hole; the square hole is connected with a protective box; the protective box is filled with heat insulation material; the middle of the heat insulation material is provided with a furnace pipe through hole communicated with the furnace body; the outer wall of the protective box corresponding to the furnace pipe through hole is connected with a flange through a bolt; the furnace tube is set in the furnace body and two ends of the furnace tube passes through the square hole of the two side walls of the furnace body and extends to the furnace tube through hole; one section of the furnace tube through hole is an exposed furnace tube; the furnace cover is hinged on the furnace body through one side edge. The utility model is the two ends of the furnace tube exposed furnace tube section is provided with a protective box, the protective box is tightly filled with the furnace tube can prevent the furnace tube optionally rotating the heat insulating material, but also can protect the furnace tube, even if the high temperature and high pressure environment in the furnace under the action of the protective box exposed section is not easy to be crushed, even the furnace tube blasting; it also can prevent the broken slag from hurting people; the protective box can be quickly detached and connected, and it is convenient to replace.