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Digital finance provides new possible ways to promote innovation-driven development strategies. Using data of 257 prefecture-level cities in China from 2011 to 2019, this paper examines the impact of digital finance on regional innovation, as well as the mediating effect of resource mismatch underlies it. The empirical results are as follows. First, digital finance can significantly boost innovation, both in terms of the quantity and quality. Second, the incentive effects of innovation have been more obviously observed in the eastern cities and the cities with high financial levels or light digital divides in China. Third, the mechanism effect implies that digital finance works positively on innovation through improving the factor allocation efficiency by alleviating the misallocation of labour and capital. These conclusions indicate that to better promote regional innovation, it is crucial to encourage the digital transformation of the financial industry, enhance digital infrastructure development, and facilitate the free flow of resources among regions. The paper offers both theoretical and empirical evidence that digital finance influences regional innovation by alleviating resource mismatches. It also examines the role of the ‘digital divide’ in shaping innovation through digital finance. These two points constitute the key innovations of the paper. [ABSTRACT FROM AUTHOR]