The invention provides a library data service expansion system and a method based on a 5G structure, wherein the system comprises three parts of a big data platform, a mobile edge calculation and a mobile user terminal. The big data platform part includes a hardware part and a software part, wherein the hardware part realizes the management node and storage node of big data platform, and the software part realizes data collection and storage, data processing, querying and pushing services. Mobile edge computing includes hadoop edge nodes, MEC wireless network information services, system authentication and access management. The mobile user terminal includes a user interface, a MEC mapping interface, service processing, and local data. The above three parts cooperate with each other to complete the collection, processing and user querying and pushing functions of Internet data. According to the system and the method, the corresponding edge node and terminal mapping are configured in the MEC, thereby improving the quality of the library data service, reducing the operation and maintenance cost, and also promotes the new application and popularization of the 5G network.