The invention discloses a washing and drying integrated machine for washing clothes by adopting water heated by a heat pump. The washing and drying integrated machine comprises an outer barrel, an inner barrel, a heat pump system and a water inlet pipeline; the inner barrel is arranged in the outer barrel; the outer barrel and the inner barrel are coaxially arranged; the heat pump system comprises an evaporator, a compressor, a two-position three-way electromagnetic valve, a condenser bank and a throttling valve, wherein the condenser bank is formed by connecting an air-cooled condenser and a water-cooled condenser in parallel; the evaporator, the compressor, the two-position three-way electromagnetic valve, the condenser bank, the throttling valve and the evaporator are connected in series to form a circulating system; the water inlet pipeline, the heat pump system and the outer barrel form a water heating system; the outer barrel is connected with the heat pump system through two sections of air flues to form a drying and circulating air path for drying the clothes; and the two-position three-way electromagnetic valve is used for switching and controlling a refrigerant through the air-cooled condenser or the water-cooled condenser to realize the cloth drying or water heating function of the washing and drying integrated machine. Besides the functions of drying the clothes and heating the water, cooling and dehumidifying functions, heating and dehumidifying functions and the like can be provided by arranging a switching mechanism and an external air inlet/outlet in the air path.