Furnace cover, furnace body structure and preparation method thereof, graphitization furnace and battery production system

The invention relates to a furnace cover, a furnace body structure and a preparation method thereof, a graphitization furnace and a battery production system, the furnace cover comprises a lining body and a cover body, the lining body is provided with a via hole, and the via hole is arranged in the thickness direction of the furnace cover in a penetrating manner. The cover body is arranged on the peripheral wall of the lining body in a surrounding mode in the direction parallel to the thickness direction and is provided with an inner end face located in the thickness direction, and a concave cavity is formed in the inner end face. According to the technical scheme, the lining body and the concave cavity are arranged on the furnace cover, the high temperature influence on the furnace cover is reduced, the heat damage probability of the furnace cover is reduced, the probability that the air tightness, strength and other performance of the furnace cover are reduced due to heat damage is reduced, the performance