The invention discloses a novel heating, humidifying and cooling integrated heat pump device. The device is characterized by comprising three parts, namely, a heat pump system, a water circuit and an air circuit; the heat pump system comprises a compressor, a four-way valve, an indoor heat exchanger, a secondary indoor heat exchanger, an one-way valve, a three-way valve, a throttling valve, an outdoor unit, an outdoor assisting heat exchanger, a liquid storing device, an air-liquid separator and an air blower; the water circuit comprises a dispenser, a water pump, a water distributor, a transfer packing layer, a water tank, a water supplementing valve, etc.; the air circuit comprises a main air returning pipeline, a branch pipeline, a primary filter, a water baffle, an activated carbon filter screen, a main air supplying pipeline, an air regulation valve, an air blower, etc. The heat pump system can be operated to heat and humidity indoor air at the same time in winter, and cool and dehumidify indoor air by evaporating a refrigerant to absorb heat and evaporating water in summer; therefore, the functions of heating, humidifying, cooling, sterilizing and the like are realized through one unit; the comfort is improved, and the energy consumption in heating and cooling is decreased.