The widening economic disparity between the northern and southern regions has constrained China's overall and further economic development. We investigate whether FinTech can mitigate the north-south economic disparity in China. Through regressing a panel dataset encompassing 285 Chinese cities from 2008 to 2021, the results confirm the effectiveness of local FinTech development. The enhancement of local FinTech development by 1% will result in a reduction of north-south economic disparity by 0.13%. The mechanism test reveals that local FinTech development contributes to the advancement of industrial gradient structure and fosters enhancements in industrial ownership structure, thereby narrowing the north-south economic disparity. Note that industrial structure can achieve more positive impacts if the local FinTech development crosses a certain threshold.