An air conditioning heat pump system using an ejector, comprising a compression assembly, an outdoor heat exchanger, a first throttle device, an indoor heat exchanger and an ejector, wherein an injection inlet of the ejector is connected to one end of the indoor heat exchanger, an ejector inlet of the ejector is connected to one end of the outdoor heat exchanger, an outlet end of the ejector is connected to a third end of the compression assembly, a first end of the compression assembly is connected to the one end of the outdoor heat exchanger, a second end of the compression assembly is connected to another end of the indoor heat exchanger, one end of the first throttle device is connected to another end of the outdoor heat exchanger, and another end of the first throttle device is connected to the one end of the indoor heat exchanger, wherein the air conditioning heat pump system using an ejector further comprises: a controllable valve for controlling the flow direction arranged on a pipe between the first end of the compression assembly and the one end of the outdoor heat exchanger, a first electromagnetic valve arranged on a pipe between the ejector inlet of the ejector and the one end of the outdoor heat exchanger, a second electromagnetic valve arranged on a pipe between the another end of the first throttle device and the one end of the indoor heat exchanger, a third electromagnetic valve arranged on a pipe between the injection inlet of the ejector and the one end of the indoor heat exchanger, a first check valve arranged on a pipe between the third end of the compression assembly and the outlet end of the ejector, a second check valve arranged on a pipe between a fourth end of the compression assembly and the another end of the first throttle device, and a controller, wherein a flow direction of the first check valve is from the outlet end of the ejector to the third end of the compression assembly; a flow direction of the second check valve is from the fourth end of the compression assembly to the another end of the first throttle device; the controllable valve is in an on state when a refrigerant flows from the first end of the compression assembly to the one end of the outdoor heat exchanger; and the controller is configured to control opening and closing of the first electromagnetic valve, the second electromagnetic valve, and the third electromagnetic valve according to a current operating mode. the air conditioning heat pump system using an ejector further comprises: a controllable valve for controlling the flow direction arranged on a pipe between the first end of the compression assembly and the one end of the outdoor heat exchanger, a first electromagnetic valve arranged on a pipe between the ejector inlet of the ejector and the one end of the outdoor heat exchanger, a second electromagnetic valve arranged on a pipe between the another end of the first throttle device and the one end of the indoor heat exchanger, a third electromagnetic valve arranged on a pipe between the injection inlet of the ejector and the one end of the indoor heat exchanger, a first check valve arranged on a pipe between the third end of the compression assembly and the outlet end of the ejector, a second check valve arranged on a pipe between a fourth end of the compression assembly and the another end of the first throttle device, and a controller, wherein a flow direction of the first check valve is from the outlet end of the ejector to the third end of the compression assembly; a flow direction of the second check valve is from the fourth end of the compression assembly to the another end of the first throttle device; the controllable valve is in an on state when a refrigerant flows from the first end of the compression assembly to the one end of the outdoor heat exchanger; and the controller is configured to control opening and closing of the first electromagnetic valve, the second electromagnetic valve, and the third electromagnetic valve according to a current operating mode.