The embodiment of the invention relates to the technical field of communication, and discloses a virtual base station construction method and device, a base station and a wireless network system. Thevirtual base station construction method comprises the following steps: acquiring wireless information of an environment where the base station is located; determining a first frequency band operatedby the virtual base station according to the wireless information; and constructing the virtual base station according to the first frequency band, wherein the virtual base station is accessed to a core network through a backhaul network. According to the implementation mode, the constructed virtual base station adapts to the surrounding wireless environment, and the construction mode is simple and flexible, and the applicability of the virtual base station is improved, and the difficulty of base station construction addressing is reduced, and the construction cost of the virtual base stationis reduced.