The invention discloses an operation and maintenance service management method and a management platform. The management method includes a state acquisition step, a state analysis step, a fault alarm step, a fault locking step, and a fault removing step. The management platform includes a state acquisition module, a state analysis module, a fault alarm module, a fault locking module, and a fault removing module. Unified, concentrated, standard and normalized monitoring and warning are realized for the business systems of a gas enterprise. The ability and efficiency of operation and maintenance management are improved. The level of information service is enhanced. Stable and reliable support and guarantee are provided for the informatization of gas enterprises. Detailed and accurate basic data is provided for the informatization development of gas enterprises. Moreover, the method and the platform have outstanding advantages, such as being systematic, advanced, open, practical, economical, scalable, stable and safe.