Abstract: Guided by human-centric values, public participation has become increasingly significant in urban renewal design. However, challenges remain in understanding the interactions between diverse stakeholders and urban spaces, accurately diagnosing existing issues and diverse demands, and deepening public involvement. The development of digital technology offers new formats and approaches for public participation in urban design. This paper identifies the bottlenecks in public participation during the stages of investigation, analysis, design, and outcome perception. It explores the construction of a digital platform for public participation in urban design tailored to urban renewal. Leveraging digital technologies, the platform facilitates real-time public data collection, integrated analysis, and simulation-based visualization, thereby enhancing the collection, transmission, translation, and perception of public opinions. Using the Yuejiang Tower project in Nanjing as a case study, this paper outlines the architecture, functionality, and practical feedback of the public participation digital platform.