Digital finance has emerged as a pivotal catalyst for economic growth in China, profoundly altering social structures and behaviors. Despite its benefits, it has also engendered financial risks, thereby complicating social governance. This study utilizes a panel dataset from China’s provinces spanning 2011 to 2021 to analyze the influence of digital finance development on cyber financial crime rates. The results reveal a positive correlation: an increment of one unit in the digital finance index is associated with a 0.058 unit increase in cyber financial crime rates. These findings are robustly supported by tests for endogeneity and robustness. Variations in impact are observed across urbanization levels and average wage brackets. And the study identifies income distribution and traditional financial demand as the mechanisms of the effect. Furthermore, this study presents strategic recommendations to enhance financial inclusion, facilitate income redistribution, strengthen cyber crime governance, and integrate digital and traditional finance for the advancement of financial modernization.