Using data from China’s A-share listed companies from 2015 to 2024, systematically investigates the impact of financial flexibility on New Quality Productive Forces and its underlying mechanisms. The findings reveal that financial flexibility significantly enhances New Quality Productive Forces. Furthermore, the speed of digital transformation and the persistence of innovation are identified as key mediating channels in this relationship. Heterogeneity analysis shows that the positive effect of financial flexibility is more pronounced in firms with high strategic divergence, a small internal pay gap, high environmental uncertainty, and substantial analyst coverage. The findings reveal the micro-level formation mechanism of New Quality Productive Forces from the perspective of financial resource allocation, offering a fresh theoretical lens for understanding how corporate financial strategy can support the goal of high-quality development.