This paper based on panel data from 38 commercial banks from 2013 to 2022, empirically analyzes the impact of digital transformation of Chinese commercial banks on bank stability, and further clarifies the relationship between digital transformation and stability of commercial banks under the impact of revenue diversification. The research has found that digital transformation of commercial banks is beneficial for improving banking operational stability, the mechanism test shows that this promoting effect is achieved primarily by lowering management costs, enhancing banks' competitiveness and improving operational efficiency. The heterogeneity analysis reveals that this promoting effect is even more pronounced among city commercial banks, banks in the central and western regions, and those with lower staffing redundancy. In addition, revenue diversification can weaken the positive impact of digital transformation on banking operational stability. In the future, we should actively promote the digital transformation of the banking industry, increase investment in digital resources, explore differentiated transformation paths, and pay attention to the differentiated impact of diversified revenue transformation, providing a solid foundation for financial stability and high-quality economic development.