According to the connotation, characteristics and components of Smart Library and the practice of Smart Library Construction at home and abroad, we set up the evaluation index system of Smart Library intelligence level. Then, using the method of combining entropy theory, gray relational analysis and D-S evidence theory, the scientific method of evaluating the intelligence level of smart library is put forward. Finally, through empirical research, it proves the objectivity and effectiveness of the intelligence level evaluation system of smart library.