Airtight structure of vacuum sintering furnace

The utility model relates to the field of vacuum sintering furnaces, in particular to an airtight structure of a vacuum sintering furnace, which can avoid uneven local stress of a circumferential bolt fixing structure and effectively solve the problems in the background technology. Comprising a furnace body which is in a cylinder shape with a side opening, supporting legs are arranged at the bottom of the furnace body, a circular furnace cover is arranged at the side opening of the furnace body, one side of the furnace cover is fixedly connected with one end of a connecting rod, and the other end of the connecting rod is hinged to the furnace body; a pushing structure matched with the furnace cover is arranged on the outer side of the furnace cover, the pushing structure comprises a circular pressing plate on the outer side of the furnace cover, a hooking piece matched with the furnace body is hinged to the edge of the inner side face of the pressing plate in the circumferential direction, and a pushing assem