Based on the balanced panel data of 245 cities in China from 2010 to 2018, the panel fixed effect model and the mediation effect model are used to empirically analyze the impact and mechanism of financial technology on green development. The study found that financial technology can significantly promote the green development of cities. From the perspective of transmission mechanism, fintech promotes green development by promoting the supply-side green technology innovation momentum and the demand-side industrial structure upgrading momentum. From the perspective of geographical structure, both fintech center spillover and local fintech agglomeration can promote green development. As the distance between cities and central cities increases, there is an alternative relationship between the role of fintech center spillover and local fintech agglomeration on green development. From a regional perspective, the role of fintech in promoting green development is the strongest in the eastern region, slightly less in the central region, and the weakest in the western region. From the perspective of internal channels, fintech promotes green development by reducing emission consumption and stimulating economic growth. From the perspective of the external environment, the dynamic neutrality of environmental regulation and financial regulation helps fintech to promote green development. This paper provides ideas for the realization of high-quality financial technology-enabled green development and the completion of China''s carbon peak and carbon neutrality.