A refrigerator, comprising: an air duct cover plate; a closed air cavity formed between the air duct cover plate and a liner of the refrigerator; an evaporator disposed on an outer surface of the liner, and a position of the evaporator being corresponding to a position of the enclosed air cavity; and an air guiding rib, wherein the air guiding rib is disposed in the closed air cavity, and wherein the air guiding rib is configured to divide the closed air cavity into an air intake region, a first air supply region, and a second air supply region that are sequentially in fluid communication; wherein, the air intake region includes an air inlet for taking in hot air in a chamber; the first air supply region is disposed above the air intake region, and the first air supply region includes an upper air outlet; the second air supply region is disposed below the first air supply region and is separated from the air intake region by the air guiding rib, and the second air supply region includes a lower air outlet; the air intake region, the first air supply region, and the second air supply region are configured to guide air taken in by the air inlet from the chamber such that the air flows upward along the air intake region and into the first air supply region, such that a portion of the air enters the chamber via the upper air outlet, and such that another portion of the air flows down into the second air supply region and enters the chamber via the lower air outlet; characterized in that, the air guiding rib includes a first air guiding rib and a second air guiding rib, wherein the first air guiding rib is a closed loop, wherein the second air guiding rib is disposed in the closed loop of the first air guiding rib and encloses the second air supply region having an open upper end and a closed lower end, wherein the air intake region is formed between the second air guiding rib and a lower end of the first air guiding rib, and wherein the first air supply region is formed between the open upper end of the second air supply region and an upper end of the first air guiding rib. an air duct cover plate; a closed air cavity formed between the air duct cover plate and a liner of the refrigerator; an evaporator disposed on an outer surface of the liner, and a position of the evaporator being corresponding to a position of the enclosed air cavity; and an air guiding rib, wherein the air guiding rib is disposed in the closed air cavity, and wherein the air guiding rib is configured to divide the closed air cavity into an air intake region, a first air supply region, and a second air supply region that are sequentially in fluid communication; wherein, the air intake region includes an air inlet for taking in hot air in a chamber; the first air supply region is disposed above the air intake region, and the first air supply region includes an upper air outlet; the second air supply region is disposed below the first air supply region and is separated from the air intake region by the air guiding rib, and the second air supply region includes a lower air outlet; the air intake region, the first air supply region, and the second air supply region are configured to guide air taken in by the air inlet from the chamber such that the air flows upward along the air intake region and into the first air supply region, such that a portion of the air enters the chamber via the upper air outlet, and such that another portion of the air flows down into the second air supply region and enters the chamber via the lower air outlet; characterized in that, the air guiding rib includes a first air guiding rib and a second air guiding rib, wherein the first air guiding rib is a closed loop, wherein the second air guiding rib is disposed in the closed loop of the first air guiding rib and encloses the second air supply region having an open upper end and a closed lower end, wherein the air intake region is formed between the second air guiding rib and a lower end of the first air guiding rib, and wherein the first air supply region is formed between the open upper end of the second air supply region and an upper end of the first air guiding rib.