In recent years, the research and application of Smart Library Based on the Internet of things have developed rapidly. The RFID intelligent library system independently developed by our company is mainly composed of six sub systems: label conversion system, intelligent book borrowing and returning system, intelligent counting car system, intelligent access control detection system, 24-hour book returning system and remote monitoring system. And the appeal subsystem is connected with the library card system, library management system and other systems to realize data interconnection and functional interaction. Each subsystem contains the corresponding hardware and software functions, which simplifies the process of borrowing and returning books, improves the circulation efficiency, greatly reduces the workload of book inventory and search, and changes the disconnection between borrowing management and security anti omission process Improve the job satisfaction of library staff, improve the satisfaction of readers