Under the action of the circulating fan, heating tube, and dehumidifying fan, the dry heat sterilizer rapidly heats up. At the same time, clean and dry air enters the sterilization chamber through a high-efficiency filter, absorbing moisture from the surface of the materials. The absorbed moisture evaporates and is discharged through the circulating channel. The dry air circulates in a directed manner under the action of the fan. As the water vapor gradually decreases, fresh filtered air is intermittently replenished. The chamber is maintained at a slightly negative pressure, and the temperature in the sterilization chamber reaches the set value. It is kept at the set temperature for insulation circulation, achieving sterilization of the sterilized items.