The spatial Durbin model was used to analyze the effect of green finance on high-quality economic development in 31 provinces(due to the lack of data, the statistical data mentioned here do not include the Tibet Autonomous Region, the Hong Kong Special Administrative Region, the Macao Special Administrative Region and Taiwan Province), municipalities and autonomous regions in China, and also to explore the role of green technology innovation in the influence of green finance on high-quality economic development. The results show that the effect of green financial development on economic high-quality development is positive. Green finance can promote high-quality economic development and has spatial spillover effects. Green technological innovation plays a partly intermediary role, and green finance can promote economic high-quality development through promoting green technological innovation. Finally, it is proposed to expand the green financial product system, make use of the spatial spillover characteristics of green finance, strengthen provincial and regional cooperation and enhance green R&D investment and patent protection.