Abstract: Abstract: In the era of digital economy, digital transformation has become an important path for the high-quality development of enterprises. The "National Big Data Comprehensive Experimental Zone" is used to construct quasi-natural experiments, based on the data of China's A-share listed companies from 2001 to 2021, and the digital transformation measurement indicators of enterprises are constructed with the help of Python crawler technology and text analysis method. From the two levels of theoretical logic and empirical evidence, the policy effect of the pilot of big data comprehensive pilot area on the digital transformation of enterprises is examined. The study finds that: First, the policy pilot of the big data comprehensive pilot zone has effectively promoted the digital transformation process of enterprises, and the research conclusion is still valid after the robustness test. Second, the mechanism analysis shows that the pilot policy of the big data comprehensive experimental zone promotes the digital transformation of enterprises through the effects of human capital and technological capital. Third, the heterogeneity analysis finds that this promotion effect differs significantly in different property rights, industry categories and financial market environments. Specifically, the policy pilot of the big data comprehensive pilot zone has a positive incentive effect on the digital transformation of private enterprises, and has a clear preference for promoting the digital transformation of traditional industries, and the developed financial market environment provides important benefits for high-quality release of policy-driven efficiency.