This paper uses the coupling coordination degree model to measure the coupling coordination development level of new urbanization and modern service industry in 29 provinces of China from 2006 to 2020, and discusses the characteristics of coupling degree change and its influencing factors. The research finds that: from the perspective of spatial dimension, there are significant regional differences in the level of the coupling and coordinated development of China's new urbanization and modern service industry, followed by the central and eastern regions, and the development of the western region lags behind, showing the gradient distribution characteristics of "eastern, central, western"; from the perspective of time, the coupling and interaction between China's new urbanization and modern service industry has a significant phase. The level of coupling and coordination has improved year by year, and some provinces have been in the stage of benign interaction and development. Finally, based on the research conclusions, this paper puts forward relevant policy recommendations.