The invention relates to a steam jet enthalpy heat pump air-conditioning hot water unit which at least comprises a compressor, a four-way reversing valve, the four-way reversing valve, an outdoor heat exchanger, a refrigeration one-way valve, a liquid storage device, an economizer, an EVI electronic expansion valve, a refrigeration electronic expansion valve, an indoor heat exchanger, a steam-liquid separator, a heating one-way valve, a heating electronic expansion valve, a hot water one-way valve and a hot water heat exchanger. The technical problems to be solved by the invention is to provide the air-conditioning hot water system with the steam jet enthalpy function and realize the steam jet enthalpy under different modes through the control of the degree of superheat of the electronic expansion valves and an unique throttling structure, thereby improving the range of applications and the efficiency of an air conditioner, leading the functions of the system to be diverse, having high energy utilization rate, improving the efficiency under various modes to the maximum extent and being characterized by simple structure, easy control, low initial investment and low operation cost.