The embodiment of the invention discloses a processing method and device for cell switching of terminals of a cluster and a base station. In the method, cell switching of the terminals is achieved through interaction of the terminals, the base station and a cluster core network. When the terminal detects that the signal of the first cell is poor and the signal of the second cell is good, a switching request for switching to the second cell is sent to the first base station, and the first base station sends the switching request to the cluster core network. And the cluster core network checks whether the second cell is in the scheduling area of the group call or not, if not, the generated extension field is sent to the second base station, and the second base station does not perform resource allocation any more after receiving the extension field, so that mistaken occupation of communication resources of the second cell is avoided. Through the method, the group call service establishedin the second cell is ensured not to be deleted any more, the establishment process of the group call service is simplified, the efficiency is improved, and the error probability is reduced.