The integration of Artificial Intelligence (AI) into digital library systems represents a paradigm shift in information management and accessibility. This research paper presents an extensive analysis of how AI technologies, particularly Natural Language Processing (NLP), Machine Learning (ML), and Semantic Web, are revolutionizing digital library services. Through a rigorous examination of current implementations, advanced mathematical models, and comprehensive empirical data collected from multiple case studies, we demonstrate the profound and multifaceted impact of AI on enhancing search capabilities, personalizing user experiences, and optimizing resource management in digital libraries.