A refrigerator, wherein the refrigerator comprises: a freezing circuit having a cooler for cooling air to be supplied through air passages to storage compartments, a cooling chamber formed with an air blowing vent communicated with the storage compartments, the cooler being disposed in the cooling chamber, a blower configured to blow air supplied through the air blowing vent to the storage compartments, and a shielding device, wherein the shielding device is configured to close air passages through which cold air is blown in a refrigerator, the shielding device comprising: a plurality of rotatable shielding walls disposed surrounding the blower from radially outside, and a shielding wall driving mechanism configured to drive the rotatable shielding wall to rotate, a plurality of the shielding wall driving mechanisms are disposed, wherein the shielding wall driving mechanism comprises: a cam rotatably connected with the rotatable shielding wall; a rotary disk formed with a slot for moving the cam; and a drive motor for driving the rotary disk to rotate, characterized in that a right end of the cam is formed with a rotatable connection portion in which is formed a hole portion through which a pin can run, wherein the rotatable shielding wall is formed with a rotatable connection portion which protrudes obliquely from a base end of the rotatable shielding wall; the rotatable connection portion is formed with a hole portion through which the pin can run; rotational connection portions are formed adjacent to both ends of a lateral side of the rotatable shielding wall; and the rotatable connection portions each are formed with a hole through which a pin can run. a freezing circuit having a cooler for cooling air to be supplied through air passages to storage compartments, a cooling chamber formed with an air blowing vent communicated with the storage compartments, the cooler being disposed in the cooling chamber, a blower configured to blow air supplied through the air blowing vent to the storage compartments, and a shielding device, wherein the shielding device is configured to close air passages through which cold air is blown in a refrigerator, the shielding device comprising: a plurality of rotatable shielding walls disposed surrounding the blower from radially outside, and a shielding wall driving mechanism configured to drive the rotatable shielding wall to rotate, a plurality of the shielding wall driving mechanisms are disposed, wherein the shielding wall driving mechanism comprises: a cam rotatably connected with the rotatable shielding wall; a rotary disk formed with a slot for moving the cam; and a drive motor for driving the rotary disk to rotate, characterized in that a right end of the cam is formed with a rotatable connection portion in which is formed a hole portion through which a pin can run, wherein the rotatable shielding wall is formed with a rotatable connection portion which protrudes obliquely from a base end of the rotatable shielding wall; the rotatable connection portion is formed with a hole portion through which the pin can run; rotational connection portions are formed adjacent to both ends of a lateral side of the rotatable shielding wall; and the rotatable connection portions each are formed with a hole through which a pin can run. a plurality of rotatable shielding walls disposed surrounding the blower from radially outside, and a shielding wall driving mechanism configured to drive the rotatable shielding wall to rotate, a plurality of the shielding wall driving mechanisms are disposed, wherein the shielding wall driving mechanism comprises: a cam rotatably connected with the rotatable shielding wall; a rotary disk formed with a slot for moving the cam; and a drive motor for driving the rotary disk to rotate, characterized in that a right end of the cam is formed with a rotatable connection portion in which is formed a hole portion through which a pin can run, wherein the rotatable shielding wall is formed with a rotatable connection portion which protrudes obliquely from a base end of the rotatable shielding wall; the rotatable connection portion is formed with a hole portion through which the pin can run; rotational connection portions are formed adjacent to both ends of a lateral side of the rotatable shielding wall; and the rotatable connection portions each are formed with a hole through which a pin can run. a cam rotatably connected with the rotatable shielding wall; a rotary disk formed with a slot for moving the cam; and a drive motor for driving the rotary disk to rotate, characterized in that a right end of the cam is formed with a rotatable connection portion in which is formed a hole portion through which a pin can run, wherein the rotatable shielding wall is formed with a rotatable connection portion which protrudes obliquely from a base end of the rotatable shielding wall; the rotatable connection portion is formed with a hole portion through which the pin can run; rotational connection portions are formed adjacent to both ends of a lateral side of the rotatable shielding wall; and the rotatable connection portions each are formed with a hole through which a pin can run.