The invention relates to a system for realizing a prepositional logic individualized telecommunication value-added service. Based on an intelligent communication network formed by a plurality of service switching points, service control points and service management points, the system further comprises a plurality of signaling message processing devices connected in a NO.7 signaling link in series and prepositionally connected to the service switching points, the prepositional signaling message processing devices perform recoding before the calling signaling message IAM enters a service switching unit, and the control logic of the individualized service is edited in, so that the purpose that the subsequent service exchanger is directed to control the finishing of connection of the individualized service is achieved. The prior communication network structure is not required to be modified by adopting the technical proposal, therefore, the signaling interaction between the service switching points and the service control points is avoided, the time delay of connection is effectively reduced, the service quality is improved, the complexity and the implementation cost of service construction are reduced, and a plurality of defects due to the adoption of the traditional intelligent network method are overcome. Various individualized telecommunication value-added services can be rapidly and effectively realized by the method.