This paper combines the current direction of library digital resource sharing platform development, puts forward the library digital resource sharing platform for knowledge management, determines the overall design ideas and framework of the platform, and then adopts the hybrid recommendation algorithm to optimise the platform of this paper. Determine the data sources and evaluation indexes, conduct comprehensive simulation analysis and questionnaires, and jointly verify the knowledge management-oriented library digital resource sharing platform. It can be concluded from the validation that the difference between the coverage rate of the hybrid recommendation and the coverage rate of the traditional recommendation method is small, and its value is 0.1015. The hybrid recommendation algorithm effectively improves the coverage rate of resource sharing on this platform, and when the number of users online at the same time is 200, the processing time of the server is 98.91ms, which makes the platform fully capable of running smoothly. The difference between the five dimensions of this paper’s platform and the traditional platform ranges from 2 to 158 at the time of satisfaction (A), which comprehensively demonstrates the superiority of this paper’s platform. In order to better promote the construction of a knowledge management-oriented library digital resource sharing platform, two optimisation strategies are proposed.