The invention relates to the technical field of air conditioner heat pumps, in particular to an energy accumulating type efficient air-cooled heat pump unit. The energy accumulating type efficient air-cooled heat pump unit comprises a refrigerating compressor, a four-way reversing valve, an outdoor side heat exchanger, an outdoor side fan, a cold accumulator, a phase change cold accumulating medium, an evaporating coiled pipe for cold accumulation, a re-cooling coiled pipe for cold accumulation, a heat accumulator, a phase change heat accumulating medium, an evaporating coiled pipe for heat accumulation, a re-cooling coiled pipe for heat accumulation, an indoor side heat exchanger, an indoor side fan, a gas-liquid separator, an evaporating pressure regulating valve, an energy accumulation type expansion valve, a drying filter, an observing mirror, a main path expansion valve, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a first check valve, a second check valve, a third check valve, a fourth check valve and a connecting pipeline. Through the assisting regulation of the cold accumulator and the heat accumulator and the skillful switching combination of one four-way reversing valve and four check valves, the problems of heat supply and refrigeration under extreme working conditions are solved, and the use temperature range of an air source heat pump is increased.