The invention relates to a washing and drying integrated machine and a mite removal method thereof, and belongs to the technical field of household appliances. An optional mite removal program is seton the washing and drying integrated machine, and the mite removal program includes drying clothes in an inner cylinder and drying the space between the inner cylinder and an outer cylinder for mite removal during washing and/or rinsing after a power supply is turned on. The invention further provides the washing and drying integrated machine, which comprises a control panel, wherein a mite removal function key is arranged on the control panel, and when the mite removal function key is triggered, the washing and drying integrated machine starts the mite removal program. Through drying the inner cylinder and the space between the inner and outer cylinders, the mite removal of the washing and drying integrated machine can be effectively and comprehensively carried out, so that the cleannessand sanitation of the inner cylinder and the space between the inner and outer cylinders are ensured, and the safety and sanitation requirements of users on the washing and drying integrated machine are met. In addition, the mite removal method adopts a drying method to remove mites, so that the damage to clothes in the mite removal process is avoided.