The invention relates to a reliability enhancement method based on a sharing protection service function chain. Provided is a method for providing end-to-end reliability protection for a service function chain in an NFV. The method significantly enhances the reliability of the service function chain, has a good application prospect in the carrier-class network environment having dynamic varying services and frequent faults, can effectively provide the end-to-end reliability protection for the service function chain in the NFV, and improves the performance of the network particularly when the requirement of the service function chain for the reliability is high. Meanwhile, the method has strong adaptability, can adapt to different network topology environment, consumes a few bandwidth resources and server computing resources while improving the reliability of the service function chain, and does not produce too high cost.