Under the background of the implementation of national culture digitization strategy, how to construct the discourse system of public art and promote cultural self-confidence and self-improvement has become an increasingly important issue. There are three interdependent realization paths from the micro, medium and macro perspectives: enhance the participation and interaction of public art works, as well as people's sense of cultural belonging, acquisition and happiness through digital intervention; expand the design and application of digital public art in urban space, and strengthen the digital display and dissemination of the symbols of Chinese civilization spirit and cultural essence; build a new discourse system for digitization of Chinese public art, promote cultural self-confidence and self-improvement, and deepen cultural exchanges and mutual learning.