The invention relates to a compression and heat resistant gear-connected bar type sealing door. The compression and heat resistant gear-connected bar type sealing door comprises a door frame, a door body, a hand wheel shaft, a hand wheel, a driving gear, driven gears, hexagon nuts, connecting rods I, guiding grooves, connecting rods II and a hinge. The door body is of a circular structure and slightly protruded in the middle, the door frame is of a ring-shaped structure, and the door frame and the door body are used in a matched mode; notches are formed in the periphery of the door body, high temperature resistant adhesive tapes are installed in the notches, so that the airtightness of the overall device is ensured, and invasion of toxic and harmful gas is prevented. According to the compression and heat resistant gear-connected bar type sealing door, the flat ends of the connecting rods II are driven to enter the door frame through movement of a gear-connected bar mechanism; with increasing of the entered flat ends of the connecting rods II, the sealing door is locked tightly, meanwhile, the self-lock function is achieved through profile connection; and the compression and heat resistant gear-connected bar type sealing door has the obvious advantages that operation is convenient, the structure is simple, the effects of compression and heat resistance, safety and reliability are achieved, and airtightness is good.