Art Design of Urban Public Space Based on Marine Culture

China's marine cultural industry is the key for the economic growth of coastal cities. The development of urban culture is synchronized with marine culture, and urban culture of coastal cities is more or less mixed, with some marine cultural elements. This study attempts to explore the overall design of public space art in coastal cities from the perspective of marine culture look deeply into the relationship between the artistic design of urban public space and marine culture and urban image building. The research results show that both the urban culture and marine culture have the characteristics of agglomeration, diversity, regionality, and radiation; the design of public art is an important factor in the design of urban image, and the design concepts of public space sculptures in coastal cities are closely related to marine culture; the public art system is a system with a sequence and hierarchical relationship; the design of art forms not only depends on their own artistic value but also echoes the surrounding cultural ideas. This study provides a theoretical basis for the rapid integration of marine and urban cultures.