The invention provides a two pipe enhanced vapor injection outdoor machine and a multi-connection system. The two pipe enhanced vapor injection outdoor machine comprises an outdoor heat exchanger, a first interface and a second interface; an enhanced vapor injection compressor includes an air outlet, an air return port and an injector; an changing-over component ranges from a first end to a fourthend, the first end of the changing-over component is connected with the air outlet, and the second end of the changing-over component is connected with the air return port; an supercooler comprises amain heat-exchange circuit and an auxiliary heat-exchange circuit, and the main heat-exchange circuit and the auxiliary heat-exchange circuit are interconnected; the main heat-exchange circuit is connected with the first interface and the second interface respectively, and the auxiliary heat-exchange circuit is connected with the injector; one end of an throttle component is connected with the outlet of the main heat-exchange circuit, and the other end of the throttle component is connected with the inlet of the outdoor heat exchanger; one end of a first pipeline is connected with the outletof the outdoor heat exchanger and the other end is located between the throttle component and the main heat-exchange circuit. The two pipe enhanced vapor injection outdoor machine is characterized bysimultaneously adding the supercooler and the throttle component, thereby significantly increasing the refrigerant circulation during the low-temperature heating operation and improving the effect ofheat-generating capacity at the same time.