Based on the financial index compiled by the financial research center of Peking University and the data related high technology industries, the provincial level panel data from 2011 to 2019 is built. The influence of digital finance on technological innovation of high-tech industry is verified by bidirectional fixed effect model. The research shows that: Firstly, digital finance significantly promote technological innovation in high-tech industry. Specifically, the innovation incentive effect of the subindex, coverage breadth and depth of use are consistent with the overall index, while the degree of digitalization shows a certain inhibitory effect on technological innovation in high-tech industry. Secondly, digital finance has an inclusive effect on the development of high-tech industries. Heterogeneity test shows that digital finance has a more significant promoting effect on technological innovation of high-tech industries in less developed areas and the areas where state-owned enterprises account for a relatively small proportion.