The utility model relates to an elevator mechanism for an air-tight door of a sterilizer and belongs to the field of medical apparatuses. The elevator mechanism for the air-tight door of the sterilizer is mainly used for ascending and descending the air-tight door of the sterilizer and comprises the air-tight door of the sterilizer and a transmission device. The elevator mechanism is characterized in that a door plate fixing seat (9) is fixed on a door plate through bolts, the transmission device is a chain transmission device, two ends of a chain (7) are fixed on two ends of the door plate fixing seat (9) through a driving gear (5) and a driven gear (8), and one side of a bottom end of the chain (7) is provided with a motor overload warning device. The chain transmission device has a simple structure and high efficiency; and the operation safety of operators and the use safety of equipment can be effectively protected by the arranged overload warning device.