A refrigerator, comprising: a refrigerator body, a front side of which is open to define a first chamber ; and a door body , used for opening and closing the first chamber and defining a second chamber , wherein the door body further defines a square annular air duct surrounding an outer side of the second chamber , and the air duct comprises an air inlet , 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 ; and the air inlet is configured for intake of cold air, each air supply section has an air supply portion for conveying the cold air to the second chamber , and the air outlet section has an air outlet for discharging the remaining cold air in the air duct , wherein the door body comprises a main door and a secondary door , wherein the main door is used for defining the second chamber and the air duct , and the secondary door is used for opening and closing the second chamber , and the refrigerator can adjust the cryogenic temperature of the second chamber by adjusting the supply of cold air from the air duct to the second chamber , thus making the second chamber a storage space being independent of the first chamber , wherein the door body comprises: an inner liner , defining the second chamber and the air inlet section ; and an enclosure cover , which surrounds and covers the inner liner at a circumferential outer side of the inner liner , so as to define the two air supply sections and the air outlet section together with an outer wall of the inner liner ; and a top of the enclosure cover is provided with an air inlet grille opposite to the air inlet , and the air outlet is provided at a bottom thereof. a refrigerator body, a front side of which is open to define a first chamber ; and a door body , used for opening and closing the first chamber and defining a second chamber , wherein the door body further defines a square annular air duct surrounding an outer side of the second chamber , and the air duct comprises an air inlet , 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 ; and the air inlet is configured for intake of cold air, each air supply section has an air supply portion for conveying the cold air to the second chamber , and the air outlet section has an air outlet for discharging the remaining cold air in the air duct , wherein the door body comprises a main door and a secondary door , wherein the main door is used for defining the second chamber and the air duct , and the secondary door is used for opening and closing the second chamber , and the refrigerator can adjust the cryogenic temperature of the second chamber by adjusting the supply of cold air from the air duct to the second chamber , thus making the second chamber a storage space being independent of the first chamber , wherein the door body comprises: an inner liner , defining the second chamber and the air inlet section ; and an enclosure cover , which surrounds and covers the inner liner at a circumferential outer side of the inner liner , so as to define the two air supply sections and the air outlet section together with an outer wall of the inner liner ; and a top of the enclosure cover is provided with an air inlet grille opposite to the air inlet , and the air outlet is provided at a bottom thereof. an inner liner , defining the second chamber and the air inlet section ; and an enclosure cover , which surrounds and covers the inner liner at a circumferential outer side of the inner liner , so as to define the two air supply sections and the air outlet section together with an outer wall of the inner liner ; and a top of the enclosure cover is provided with an air inlet grille opposite to the air inlet , and the air outlet is provided at a bottom thereof. <EOS>