High-temperature kiln for firing aluminum oxide

The utility model discloses a high-temperature kiln for alumina firing, which relates to the technical field of high-temperature kilns and comprises a base, a first kiln, a second kiln, a third kiln and a fourth kiln, a screw is rotatably mounted at the top end of the base, the outer wall of the screw is in threaded connection with a load bearing plate, and a plurality of connecting channels are arranged at the top end of the base. By arranging the opening and closing unit, the burning bearing plate drives the pressing block to move, one pressing block triggers the switch, the electromagnet is electrified to attract the iron plate, the iron plate drives the connecting plate to move, the connecting plate drives the spring shaft to move, the reset spring is stressed to contract, meanwhile, the connecting plate drives the heat insulation door to move, and therefore the connecting channel is opened; the crucible containing aluminum oxide is driven by the burning bearing plate to enter the second kiln from the fir