The 14th Five-Year Plan is the top-level design of the development of public libraries in the next five years, which can bring together collective consensus and lead the development direction of the cause. 2020 is the year of the 13th Five-Year Plan and the year of the 14th Five-Year Plan. Social space-time provides a theoretical perspective for the development of public library's "14th Five-Year Plan". The digital construction of public cultural services and the innovation of "four-oriented" services will open up a new social space for the development of public libraries during the 14th Five-Year period.