The vertical vacuum hot pressing sintering furnace includes the furnace body, furnace cover, insulation barrel, reflection barrel, heating body, upper pressure head, lower pressure head, upper oil cylinder, lower oil cylinder, and vacuum pumping part. The support mechanism of the vertical vacuum hot pressing sintering furnace with upper and lower oil cylinders is a double column structure made of hot-rolled channel steel. The upper and lower oil cylinders are respectively installed at the upper end of the support body and the middle part of the base. The upper oil cylinder is connected to the load sensor, the lower end of the load sensor is connected to the water-cooled pressure head, and the lower end of the water-cooled pressure head is connected to the upper graphite pressure head. The lower oil cylinder is connected to the lower cooling head, and the lower cooling head is connected to the lower graphite head. The sintering furnace is fixed in the middle of the crossbeam of the support frame through welding. The vertical vacuum hot pressing sintering furnace is equipped with a mold support body on the bottom surface of the heating chamber, and the forming mold is set on the mold support body. The cylindrical heating chamber is arranged inside the furnace body and positioned by a tray structure. A pressure head through hole is symmetrically opened on the upper and lower end faces of the vertical vacuum hot pressing sintering furnace body and the heating chamber, and the upper and lower top rods respectively pass through the pressure head through hole on the heating chamber. The three sets of conductive electrodes are respectively equipped with insulation sleeves and thermal radiation shielding rings, and the baffle is located in the heating room. The three conductive electrodes are connected to the graphite electrode heating body through water-cooled electrodes. The vertical vacuum hot pressing sintering furnace adopts a separation design between the furnace body and the furnace cover, which are sealed and combined with six hinge bolts through the furnace ears and sealing rings.