Web3.0 is a new network environment for personalized information services in libraries, and it is also a tool used by libraries to meet the requirements of personalized information users deeply. The concept of Web3.0 has made an in-depth and detailed various services of libraries. This article mainly elaborates on the content, service mode, and framework of personalized information services in libraries under the Web3.0 environment. It is significant that libraries will have greater leaps and developments under the Web 3.0 environment in the future. At Present, with the quickly development of internet, The network environment of the library has also been constantly changing. From early versions of web1.0, web2.0 and web3.0, the continuous upgrading of this network environment has provided a technical foundation for personalized information services in libraries.Web3.0 is a new internet technology that provides users with convenient, fast, and personalized online information in a concise manner. It meets the technical requirements of users for information services in the era of big data. As a traditional information service center, how to innovate library services under the impact of Web3.0 is an urgent problem that the library needs to face at present.