In order to solve the problem of weak comfort due to refrigeration or heating delay or even if incapability of refrigerating or heating caused by reversing delay or no in-place of reversing of refrigerant in a heat pump air conditioning system in the prior art, the invention provides a heat pump air conditioning system of a pure electric vehicle and the pure electric vehicle. The heat pump air conditioning system of the pure electric vehicle comprises an electric compressor, a gas-liquid separator, an internal first heat exchanger, an external first heat exchanger, an intersystem heat exchanger, a first expansion valve, an external second heat exchanger, a second expansion valve, an electric water pump, an internal second heat exchanger, multiple pipes connected among equipment, and valves arranged on the pipes. The heat pump air conditioning system of the pure electric vehicle realizes the functions of refrigerant refrigeration and secondary heating of coolant of the vehicle air conditioning system, and effectively prevents the refrigeration or heating delay, or even the condition of incapability of refrigerating or heating; and meanwhile, the heat pump air conditioning system of the pure electric vehicle is higher in heating energy efficiency, high in comfort, simple and liable to perform.