Abstract: Deep learning is a hot research topic in the field of machine learning, which helps improve the intelligent service level of digital library. This paper introduced the concept, characteristics and application status of deep learning, and pointed out that the application of deep learning technology in digital library can improve the objectivity of information analysis, realize the intelligent processing of mass data, promote the intelligence of information analysis tools, and analyzed the service process, as well as intelligent retrieval, intelligent push and intelligent guidance service mode.