The paper analyzes the evolutionary features of the mutually beneficial symbiosis between users and library smart services from a symbiotic perspective, explores the operation mechanism of the symbiotic model of library smart services, and provides new ideas for achieving the mutual win-win situation of the respective value goals of users and library smart services. The paper combines the basic elements of symbiosis theory to construct the system structure diagram of library smart services symbiosis model, adopts the system dynamics method to explore the dynamic evolution trend of library smart services symbiosis model at different stages and identifying the key constituent elements, and verifying the effectiveness of library smart services symbiosis model system through system dynamics simulation, then discusses the realization mechanism of library smart service symbiosis model. The evolution of library smart services’ symbiosis model has gone through four stages: point symbiosis, intermittent symbiosis, continuous symbiosis and integrated symbiosis. The research found that the level of library smart services development, the degree of value realization, library services innovation and user knowledge innovation are the key constituent elements, and the services value are fully realized in the integrated symbiosis stage.