Businesses’ environmental performance is a key component of their own competitiveness as well as a key sign of long-term, sustainable social and economic growth. This study investigates the relationship between fintech and corporate greenwashing using data from Chinese a-share listed businesses from 2010 to 2021. It finds that fintech will prevent corporate greenwashing and passes several robustness tests. The mechanism analysis shows that fintech reduces corporate greenwashing by increasing information openness and green innovation activities of enterprises. In these activities, the quality of environmental disclosure made by firms is substituted. The results of the regional heterogeneity test indicate that fintech has a more negative impact on greenwashing in the central and western areas.