Abstract: Green finance has the feature of dual attributes of financial resource allocation and environmental regulation. Exploring the spatiotemporal characteristics and the influencing factors of the coupling coordination degree between ecological environment and green finance is of great significance for promoting green transformation in economic and achieving the carbon peaking and carbon neutrality goals. This paper took the Yangtze River Economic Belt as the research object to reveal the spatiotemporal characteristics of the coupling coordination degree. The coupling coordination evaluation index system was constructed, using the methods of kernel density estimation and standard deviation ellipse. The influencing factors were identified using bidirectional fixed-effect model. The results showed that：（1）There was an overall increase in the coupling coordination degree between the ecological environment and green finance in Yangtze River Economic Belt，accompanied by a phenomenon of multipolar differentiation. The coupling coordination degree in downstream areas increased faster than that in upstream and midstream areas. （2）The spatial differences in coupling coordination degree between the two systems were obvious. A spatial pattern of multi-core development presented, with Shanghai as the core and Nanjing，Hangzhou，Chengdu，and Chongqing cities as the sub-cores. （3）The effects in the order of green innovation，government support，openness，economic foundation，human capital，industrial structure，and energy intensity on the coupling coordination degree of the two systems gradually weakened. The effects of each factor demonstrated a spatiotemporal heterogeneity for different periods and regions.