A refrigerator comprising a storage compartment (101, 102, 103), and an air channel configured to deliver cooling air to the storage compartment (101, 102, 103), and further comprising a ventilation door device comprising: a bottom frame provided with a ventilation opening and a base plate portion, the ventilation opening disposed at one end portion of the bottom frame and penetrating through the base plate portion along a direction perpendicular to the base plate portion, the bottom frame further including flanged portions respectively extending from two sides of the base plate portion toward one side thereof, bent portions respectively extending from an end portion of the relative flanged portion toward an inner direction of the bottom frame, and a connecting portion connected between the flanged portions and the bent portions at two sides; a door plate abutting against the bottom frame, configured to shift along a parallel plane of the bottom frame so as to adjust an area of the ventilation opening shielded by the door plate, and having, at a side opposing the bottom frame, a guideway formed at a predetermined angle with respect to the shifting direction of the door plate; and an adjustment member having a guide post protruding toward the guideway, wherein the guide post is movably embedded in the guideway, so that the guide post drives the door plate to shift when the adjustment member moves in a direction perpendicular to the shifting direction of the door plate, wherein the surface of the door plate protrudes outwards to form a wall of the guideway, wherein the ventilation opening is rectangular, and the door plate is rectangular and has an area larger than that of the ventilation opening; and the ventilation door device is configured to completely seal the ventilation opening when the guide post moves to the first end of the guideway, and a ventilation area of the ventilation opening is gradually increased when the guide post moves from the first end of the guideway toward the second end thereof, wherein the bottom frame is disposed in the air channel, and the flow rate of the cooling air in the air channel is adjusted by adjusting a ventilation area of the ventilation opening.. a bottom frame provided with a ventilation opening and a base plate portion, the ventilation opening disposed at one end portion of the bottom frame and penetrating through the base plate portion along a direction perpendicular to the base plate portion, the bottom frame further including flanged portions respectively extending from two sides of the base plate portion toward one side thereof, bent portions respectively extending from an end portion of the relative flanged portion toward an inner direction of the bottom frame, and a connecting portion connected between the flanged portions and the bent portions at two sides; a door plate abutting against the bottom frame, configured to shift along a parallel plane of the bottom frame so as to adjust an area of the ventilation opening shielded by the door plate, and having, at a side opposing the bottom frame, a guideway formed at a predetermined angle with respect to the shifting direction of the door plate; and an adjustment member having a guide post protruding toward the guideway, wherein the guide post is movably embedded in the guideway, so that the guide post drives the door plate to shift when the adjustment member moves in a direction perpendicular to the shifting direction of the door plate, wherein the surface of the door plate protrudes outwards to form a wall of the guideway, wherein the ventilation opening is rectangular, and the door plate is rectangular and has an area larger than that of the ventilation opening; and the ventilation door device is configured to completely seal the ventilation opening when the guide post moves to the first end of the guideway, and a ventilation area of the ventilation opening is gradually increased when the guide post moves from the first end of the guideway toward the second end thereof, wherein the bottom frame is disposed in the air channel, and the flow rate of the cooling air in the air channel is adjusted by adjusting a ventilation area of the ventilation opening..