Public digital cultural services are an important part of the development of public culture in the new era. Using the current big data t e chnology can bring multi-faceted and in-depth services model innovation. This paper firstly illustrates that big data and public digital cultural services are not isolated, but can complement each other and promote steps. Secondly, from the perspectives of supply, user and management, the paper summarizes the driving of big data technology to the innovation of public digital culture service mode. The service subject, service process and mode of public digital cultural service under the big data environment are analyzed, and a public digital cultural service model is constructed with big data platform as the backbone. Based on the research, the author put forward model operation suggestion so as to provide reference for promoting the innovation and development of public digital cultural service in the big data environment.