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An extensive economic growth mode leads to resource depletion and environmental degradation. Green development is the best way to solve this problem. We analyzed the sample data of 41 cities in the Yangtze River Delta of China from 2007 to 2019. We used the spatial Durbin model and interaction term model to study the effects of regional financial agglomeration (FA) on green development and the moderating role of green technology innovation. The results show that FA promotes local green development but inhibits the green development of neighboring areas. Because the polarization effect of the growth pole is greater than its dispersion effect, cities with high levels of FA have a strong "siphon effect" on the surrounding areas. Green technology innovation positively moderates the promoting effect of FA on green development; the higher the level of green technology innovation and the degree of emphasis on it, the stronger the promoting effect. The government should encourage green finance to promote green technology innovation and promote the green development of the regional economy. These findings provide new insights for developing countries to achieve sustainable development under environmental constraints. [ABSTRACT FROM AUTHOR]