By summing up the expansion approach of public art installation digitization, the design of art installation is combined with the image of Jiangnan traditional garden to inject new vigor and vitality into the display and application of art installation in the city. Taking the historical street of Pingjiang Road in Suzhou as the design background, starting from three aspects of space conception, content design and multimedia design, through the design and application of “digital art installation”, this paper combines the creativity of modern technology, traditional culture and art installation, and provides more technical paths for expanding the experience of urban art installation. Taking Jiangnan traditional garden image as the breakthrough point of design symbols and regional historical street as the background, this paper attempts to explore a new concept and form, and reconstructs the symbolic expression of traditional culture in a digital way, so as to play a role in urban tourist street, cultural heritage protection, and regional traditional culture output.