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 (122, 123) 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 (122, 123) 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 (122, 123) 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 (122, 123) 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 (122, 123) 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.