Public art and urban art are two independent and interdependent concepts. Public art is characterized by publicity, which refers to the unique artistic features displayed in the urban public domain. Urban art is relatively restrained and implicit, which refers to the historical culture accumulated in the historical development of the city. However, there is a certain commonality between them, which can influence each other, promote each other and develop each other, and have an important impact on contemporary urban development and urban construction. This paper mainly explores the symbiosis between public art and urban art, and further analyzes and explains the symbiotic forms between public art and urban art.