The invention discloses a plug-in management method, device and system based on a mobile terminal and belongs to the field of computers. The method includes: host software of the mobile terminal transmits an inquiry broadcast to collect related information of locally mounted plug-ins; the host software starts the corresponding plug-ins according to the related information. By the method, a third party other than a software service provider can develop plug-ins, and accordingly software updating cycles of the mobile terminal are shortened, and functions of the mobile terminal can be expanded fast.