This study investigates how digital transformation can affect ESG performance within China’s unique environment. Using data from Chinese A-share listed firms from 2009 to 2022, this paper reveals digital transformation can positively affect ESG performance. Within the mechanism, customer concentration plays a medicating effect and organizational structure stability plays a positive moderating effect. Besides, the effect of digital transformation on ESG performance is more pronounced in Chinese western enterprises, non-heavy polluting industries and large-size enterprises. To our knowledge, this paper is one of the pioneering studies that examines the relationship between digital transformation and ESG performance from the perspective of supply chain management.