Method and device for reconnecting multi-carrier system

The invention discloses a method for reconnecting a multi-carrier system. The method comprises the following steps: if a reconnecting process is triggered by user equipment (UE) under a multi-carrier state, utilizing a network side device to receive the reconnecting request information which is sent to the network side device from a selected cell by the UE, and utilizing the network side device to perform wireless resource allocation on the multi-carrier of the UE according to the reconnecting request information. By using the method provided by the embodiment of the invention, the hollow signaling overhead is saved and the state transition delay is reduced.