Disclosed are a method for controlling a degree of superheat of a vehicle air-conditioning system, and a vehicle air-conditioning system. The method comprises: acquiring an actual degree of superheat in real time, a preset degree of superheat and feed-forward information which influences the variation of the actual degree of superheat; and adjusting a degree of opening of an electronic expansion valve in real time according to the acquired actual degree of superheat, preset degree of superheat and feed-forward information,, so as to control the degree of superheat of the vehicle air-conditioning system.
