Washing machine and tub drying method thereof

The invention discloses a washing machine and a tub drying method thereof. The washing machine comprises a dehydration tub and an air supply device, wherein the dehydration tub is used for containing washings to be dehydrated, the end face of one axial side is open, the dehydration tub can rotate around the central axis of the dehydration tub, an air supply port of the air supply device faces the open end face of the dehydration tub and is used for heating airflow and blowing the heated airflow into the dehydration tub through an air supply outlet. According to the washing machine, the risk of dirt and bacterium remaining due to accumulated water in the tub can be effectively reduced, mildew is decreased, and the cleaning degree of the washing machine is improved. In addition, the air supply port of the air supply device faces the open end face of the dehydration tub, accordingly the air supplying efficiency can be effectively improved, the installing difficult of the air supply device can be reduced, the tub