Abstract: A clothes dryer includes a housing, a tumbler and a heat exchange component. The housing has an air cavity therein. The air cavity and the tumbler form a closed-loop air duct. A blower impeller for driving air to flow is provided in the housing. The heat exchange component comprises a compressor, a condenser and an evaporator. The compressor is used to compress a working medium into a high temperature and high pressure state, and the condenser communicates with the evaporator through a throttle capillary. The heat exchange component further includes a reversing valve. The reversing valve can switch between two modes through a remote control program. The clothes dryer can perform self-cleaning.