This paper mainly explores the integration and development of smart tourism and public digital cultural service platforms to provide better tourism experiences and cultural services. Firstly, the concepts and characteristics of smart tourism and public digital cultural service platforms are introduced, clarifying their relationship and roles. Then, the mechanisms of integration are discussed, emphasizing the integration of data, technology, and services, as well as the active participation and support of enterprises and the public. Next, through case analysis, the integration effects and practical applications are demonstrated, including using smart tourism platforms to provide cultural guided tours and interactive experiences and promoting tourist attractions and activities through public digital cultural service platforms. These cases prove the importance and value of integration in enhancing public participation and satisfaction in tourism and culture. The integration and development of smart tourism and public digital cultural service platforms have a positive impact on promoting sustainable tourism and cultural development.