The invention provides a refrigerator and a control method thereof. The refrigerator comprises a freezing chamber, a freezing liner, a refrigeration system used for supplying cold energy to the freezing chamber, an air duct used for transferring the cold energy generated by the refrigeration system to the freezing chamber, and a first airtight drawer accommodated inside the freezing liner. The freezing liner is provided with a first air outlet and a second air outlet which enable the air duct to communicate with the freezing chamber. The first airtight drawer is provided with an air inlet which communicates with the first air outlet when the first airtight drawer is accommodated inside the freezing liner, and therefore cold air in the air duct can enter the first airtight drawer to decrease temperature fluctuation in the first airtight drawer when being blown out from the first air outlet, and achieves a good refrigeration effect. Cold air in the air duct can enter the freezing chamber to indirectly exchange heat with food in the first airtight drawer when being blown out from the second air outlet, and therefore the food in the first airtight drawer is prevented from being air-dried, and a good preservative effect is achieved.