A toner cartridge with a pressure device, the pressure device comprising: an inner cover, which is arranged at a toner feeding port of the toner cartridge; an airbag, which is made of elastic material, wherein: the airbag, comprises a fixed end that is fixed to the inner cover and a free end that extends outward from the fixed end; the fixed end is provided with an airbag opening interconnected to an interior of the toner cartridge; and a remaining portion of the airbag is arranged as closed except for the airbag opening; and a sliding member with a first end connected to the free end of the airbag, wherein: the first end of the sliding member is able to move toward the fixed end of the airbag back and forth, so that the airbag ejects gas into the toner cartridge by means of being compressed; characterized in that the toner cartridge further comprises: an outer cover, wherein: an elliptical annular groove facing the toner cartridge is formed on the outer cover; a center line of the elliptical annular groove and an axis of the toner cartridge are collinear; wherein: a slide portion is arranged at a side of the inner cover, close to the elliptical annular groove; a sliding slot, which penetrates through the slide portion in an axial direction and extends along a radial direction, is provided on the slide portion; a middle part of the sliding member is able to slide in the sliding slot; a second end of the sliding member is slidably embedded in the elliptical annular groove; when the slide portion rotates with the toner cartridge relative to the outer cover, the sliding member slides back and forth in the sliding slot. an inner cover, which is arranged at a toner feeding port of the toner cartridge; an airbag, which is made of elastic material, wherein: the airbag, comprises a fixed end that is fixed to the inner cover and a free end that extends outward from the fixed end; the fixed end is provided with an airbag opening interconnected to an interior of the toner cartridge; and a remaining portion of the airbag is arranged as closed except for the airbag opening; and a sliding member with a first end connected to the free end of the airbag, wherein: the first end of the sliding member is able to move toward the fixed end of the airbag back and forth, so that the airbag ejects gas into the toner cartridge by means of being compressed; characterized in that the toner cartridge further comprises: an outer cover, wherein: an elliptical annular groove facing the toner cartridge is formed on the outer cover; a center line of the elliptical annular groove and an axis of the toner cartridge are collinear; wherein: a slide portion is arranged at a side of the inner cover, close to the elliptical annular groove; a sliding slot, which penetrates through the slide portion in an axial direction and extends along a radial direction, is provided on the slide portion; a middle part of the sliding member is able to slide in the sliding slot; a second end of the sliding member is slidably embedded in the elliptical annular groove; when the slide portion rotates with the toner cartridge relative to the outer cover, the sliding member slides back and forth in the sliding slot. an outer cover, wherein: an elliptical annular groove facing the toner cartridge is formed on the outer cover; a center line of the elliptical annular groove and an axis of the toner cartridge are collinear; wherein: a slide portion is arranged at a side of the inner cover, close to the elliptical annular groove; a sliding slot, which penetrates through the slide portion in an axial direction and extends along a radial direction, is provided on the slide portion; a middle part of the sliding member is able to slide in the sliding slot; a second end of the sliding member is slidably embedded in the elliptical annular groove; when the slide portion rotates with the toner cartridge relative to the outer cover, the sliding member slides back and forth in the sliding slot.