With the rapid development of information technology, the digital book resources of university libraries are increasingly abundant, and it is urgent to carry out scientific and effective classification management. This paper deeply explores the classification management of digital books in university libraries. Firstly, it expounds the importance of classification management of digital books, including improving the efficiency of book retrieval, optimizing the allocation of book resources and promoting knowledge sharing and academic exchange. Then, it analyzes the current situation and problems of digital book classification management in university libraries, mainly including inconsistent classification standards, single classification methods and insufficient technical support. Aiming at these problems, corresponding strategies are put forward, such as formulating a unified classification standard and establishing a dynamic update mechanism; Comprehensive use of a variety of classification methods, including classification based on user needs and knowledge graphs; Strengthen technical support, increase technical investment and train professional and technical personnel; Increase user engagement, encourage reader feedback and conduct user training activities. Through these explorations, it aims to provide a useful reference for the classification management of digital books in university libraries, so as to better meet the needs of college teachers and students for information resources.