Cloud storage technology can create reliable resource storage environment, and provide guarantee for long-term preservation and efficient service of digital library collection resource. On the basis of introducing the concept, technical foundation and application scope of cloud storage, this paper analyzed the advantages of cloud storage technology used in the long-term preservation of digital library resource, studied the cloud storage mode of digital library collection resource such as private cloud, shared cloud, alliance cloud and so on, and proposed the construction of digital books based on cloud storage technology. The long- term preservation system of library collection resource, so as to ensure the long-term preservation of library resource, and enhance the quality of library resources construction and service.