This paper analyzes the basic framework, cloud service mode, and cloud service approach of digital library cloud service platform under cloud computing environment and studies the future development trend of cloud service platform and cloud service mode of digital library under cloud computing environment. This paper introduces the advantages of cloud service platform construction in digital reading promotion of university library in detail, expounds the construction and application of cloud service platform for digital reading promotion of university library, and puts forward the construction and promotion strategy of reading service platform of university library and the framework model of personalized information service of digital library. By describing the technical characteristics of cloud platform, the advantages of digital reading based on cloud platform are revealed, such as massive data storage, personalized service virtualization, and big data statistical analysis. On this basis, the innovation of digital reading promotion mode in colleges and universities is discussed. This study is conducive to promoting the standardized management of reading and information services and the rational allocation of resources in university libraries in order to provide some reference for the practice of building and popularizing the reading service platform of university library.