The invention relates to a refrigerator air duct which can adjust
air volume. The air duct is arranged between a freezer compartment and a refrigerator compartment, and fixed with an internal bladder of the refrigerator, a vertical section of the air duct is provided with an
air volume adjusting device, wherein, the
air volume adjusting device is a gear-rack transitional plate mechanism, the rack is arranged in a slideway which is fixed with the internal bladder and vertical to an axis of the air duct through a slider, a wind shield is fixed with the rack, a gear is meshed with the rack and pivoted on the wall of the internal bladder through a shaft, and a handwheel is fixed with the shaft. The invention uses adjusting mechanisms, such as the gear, the rack, the
crank-slider, etc. to replace a stepped positioning adjustment of a plurality of positioning blocks, thereby achieving continuous temperature adjusting and fulfilling using requirements of users; meanwhile, the invention uses a
planet gear with self lock function, a gear rack mechanism and a regulating handwheel, positioning can be reliable, a rotation of a regulating ring caused by unbalanced weight is prevented, and the well adjusted temperature can not be changed, under transportation or vibration conditions.