A radio resource configuration method and device are disclosed. The radio resource configuration method includes: after a piece of user equipment UE establishes a connection with a base station according to a system bandwidth in a broadcast message, determining, by the base station for the UE, resource configuration used for communication between the UE and the base station, where the resource configuration includes at least one of a resource allocation bandwidth, a channel state information CSI pilot bandwidth, and a CSI measurement bandwidth, where the resource allocation bandwidth is a bandwidth used to generate resource block allocation information in downlink control information; and sending, by the base station to the UE by using dedicated signaling or a common message, the resource configuration determined for the UE and used for communication between the UE and the base station.