An air-cooled refrigerator, comprising: a bottom liner, a bottom of which is provided with a cooling chamber for arranging an evaporator of the refrigerator, and is provided with a side return air inlet in communication with the cooling chamber; a plurality of upper liners (120, 130), arranged in sequence above the bottom liner, an exhaust outlet being formed in each upper liner (120, 130); and a return air duct, extending downwards to the side return air inlet along the exhaust outlets of the plurality of upper liners (120, 130) to divert return air flows of a refrigerating compartment and a variable temperature compartment, wherein a segment of the return air duct situated between a second upper liner and a first upper liner is simultaneously bent in the depth and transverse directions; wherein the plurality of exhaust outlets are all provided in positions of rear walls of the corresponding upper liners (120, 130) close to edges of one side; wherein the first upper liner is located above the bottom liner, and the second upper liner is located above the first upper liner; wherein a space of the bottom liner above the cooling chamber is configured as a freezing compartment; an internal space of the first upper liner is configured as the variable temperature compartment; and an internal space of the second upper liner is configured as the refrigerating compartment; wherein the segment of the return air duct between the second upper liner and the first upper liner is gradually bent, so as to extend from the position of the exhaust outlet of the second upper liner to the position of the exhaust outlet of the first upper liner. a bottom liner, a bottom of which is provided with a cooling chamber for arranging an evaporator of the refrigerator, and is provided with a side return air inlet in communication with the cooling chamber; a plurality of upper liners (120, 130), arranged in sequence above the bottom liner, an exhaust outlet being formed in each upper liner (120, 130); and a return air duct, extending downwards to the side return air inlet along the exhaust outlets of the plurality of upper liners (120, 130) to divert return air flows of a refrigerating compartment and a variable temperature compartment, wherein a segment of the return air duct situated between a second upper liner and a first upper liner is simultaneously bent in the depth and transverse directions; wherein the plurality of exhaust outlets are all provided in positions of rear walls of the corresponding upper liners (120, 130) close to edges of one side; wherein the first upper liner is located above the bottom liner, and the second upper liner is located above the first upper liner; wherein a space of the bottom liner above the cooling chamber is configured as a freezing compartment; an internal space of the first upper liner is configured as the variable temperature compartment; and an internal space of the second upper liner is configured as the refrigerating compartment; wherein the segment of the return air duct between the second upper liner and the first upper liner is gradually bent, so as to extend from the position of the exhaust outlet of the second upper liner to the position of the exhaust outlet of the first upper liner.