Method and device for selecting core network to be accessed

The embodiment of the invention discloses a method and a device for selecting a core network to be accessed. The method for selecting the core network to be accessed comprises the following steps of: broadcasting a core network identifier of a shared radio access network (RAN) to user equipment (UE); receiving a core network selection indication message generated and transmitted according to the broadcast core network identifier of the shared RAN from the UE; and judging whether the core network selection indication message carries a home core network identifier or not, and if the core network selection indication message carries the home core network identifier, selecting the core network to be accessed for the UE according to an access control strategy configured in advance by a networkside. By the scheme, the network side can learn that the UE is a roaming user according to the home core network identifier reported by the UE, and further select the core network to be accessed for the UE according to the access control strategy which is configured in advance, thereby realizing the flexible control of an operator over the core network to be accessed by the roaming user.