The present invention aims to provide a core network device for distinguishing base stations in different frequency bands and a processing method thereof to solve the problems in the prior technical scheme and reduce the cost of networking. The method for processing a core network device for distinguishing base stations in different frequency bands comprises the following steps: receiving data transmitted by base stations in different frequency bands through a unified interface; acquiring frequency band information of data received by the unified interface; and selecting a protocol stack of the corresponding frequency band according to the frequency band information to process the data. A core network device for distinguishing base stations in different frequency bands comprises a unifiedinterface module, a frequency band information acquisition module and a processing module. The core network device for distinguishing base stations in different frequency bands and the processing method thereof have the following beneficial technical effects: the core network device receives the data sent by the base stations in different frequency bands through the unified structure, so that whenthe power wireless private network uses two or more frequency bands at the same time, it is not necessary to set up multiple core networks, thereby reducing the cost of networking.