The work aims to explore the digital design and inheritance path of the intangible cultural heritage Jiangnan Sizhu, and provide certain ideas and action references for the digital creation of traditional music intangible cultural heritage. On the basis of sorting out the characteristics of Jiangnan Sizhu, the digital design logic was analyzed and the functional modules and interaction mechanisms of the digital platform for Jiangnan Sizhu were investigated, thus constructing the digital platform design system of Jiangnan Sizhu and carrying out digital product design practice based on this. The digital platform for the intangible cultural heritage of Jiangnan Sizhu can bring users innovative interactive experiences and enhance users' immersion and embodiment. It helps to enhance the creative effect of Jiangnan Sizhu, and at the same time provides certain references for the protection and revitalization design of other traditional music intangible cultural heritage.