The invention discloses a sintering furnace bottom cover lifting and pressing mechanism. The sintering furnace bottom cover lifting and pressing mechanism comprises a sintering furnace body, a furnacebottom cover and a lifting and pressing mechanism body, wherein the sintering furnace body is arranged on a support, the furnace bottom cover is arranged at the bottom of the sintering furnace body,the lifting and pressing mechanism body is arranged on the furnace bottom cover, guide rods are vertically arranged on the periphery of the top face of the base, the guide rods are sleeved with a supporting table and are in sliding connection with the supporting table, the furnace bottom cover is fixedly installed on the supporting table, the bottom ends of first screw rods extend into the base and are rotationally connected with the base, the bottoms of the first screw rods are connected with driven bevel gears, the driven bevel gears are in engaged connection with driving bevel gears, two sets of driving bevel gears sleeve the two sides of a connecting shaft, and one end of the connecting shaft is rotationally installed on the inner wall of the base, and the other end of the connecting shaft extends to the outer side of the base and is connected with a first handle. According to the sintering furnace bottom cover lifting and pressing mechanism, by means of the lifting and pressing mechanism body, the furnace bottom cover and the sintering furnace body can be conveniently pressed and closed, and therefore the working efficiency of installation of the furnace bottom cover is greatly improved.