A refrigerator comprises: a refrigerator body having an open front side to define a first chamber; and a door body used to open or close the first chamber and defining a second chamber. The door body further defines a square annular air duct surrounding an outer side of the second chamber. The air duct comprises an air inlet section, two air supply sections and an air outlet section which are respectively located at an upper side, two transverse sides and a lower side of the second chamber. The air inlet section has an air inlet for intake of cold air. Each air supply section has an air supply portion for supplying the cold air to the second chamber. The air outlet section has an air outlet for discharging the remaining cold air in the air duct. The temperature in the chamber defined by the door body can be independently controlled.