The invention discloses a plug-in management method, device and system and belongs to the technical field of computers. The method comprises the steps that a plug-in information acquisition request is sent to a server so that the server can feed back all sets of stored first plug-in information; all the sets of stored first plug-in information are acquired; all the sets of received first plug-in information are compared with all sets of prestored second plug-in information of a terminal, and different plug-in information is screened out; updating management is conducted on plug-ins, corresponding to the different plug-in information, in the terminal. According to the plug-in management method, device and system, the different plug-in information is screened out by comparing all the sets of first plug-in information stored in the server and all the sets of second plug-in information prestored in the terminal, and updating management is conducted on the plug-ins, corresponding to the different plug-in information, in the terminal; the problem that the plug-ins of application programs in the terminal are not convenient to manage uniformly in the prior art is solved; the effect that updating of the plug-ins in the terminal can be managed uniformly is achieved.