Digital transformation is an effective way for enterprises to improve the concentration of supply chain. The panel data of China’s Shanghai and Shenzhen A-share listed companies from 2011 to 2021 were used for empirical test to explore the impact of digital transformation on the concentration of enterprise supply chain. The results show that there is a significant negative correlation between enterprise digital transformation and supply chain concentration. Further research shows that information transparency plays an intermediary role between digital transformation and supply chain concentration, that is, digital transformation can effectively promote the improvement of information transparency and then reduce the concentration of enterprise supply chain. The conclusion of this study has theoretical and practical significance for enterprises to make reasonable use of digital transformation to improve information transparency, select better suppliers and find potential customers.