Washing and drying machine for increasing the speed of drying

A washing and drying machine is suitable for washing and drying multiple pieces of clothing. The washing and drying machine includes a housing, a drum, an air flow pipeline device and an air blowing device. The housing has an exhaust hole. The drum is arranged in the housing, and defines a washing tank, a first opening and a second opening. The air flow pipeline device is arranged on the housing and configured to be in communication with the washing tank. The air flow pipeline device includes an exhaust housing unit in communication with the first opening and the exhaust hole. The exhaust housing unit is provided with an exhaust housing body, an exhaust valve movably arranged in the exhaust housing body, and an air inlet in communication with the first opening. The air blowing device is arranged in the air flow pipeline device and configured to blow air to the air flow pipeline device to generate air flow so as to dry the clothes. The exhaust valve can be driven to switch between a closed state and an open st