Supply chain security plays a critical role in ensuring the stable and continuous operation of society. Moreover, enhancing the quality of export products is crucial for improving environmental sustainability, as it helps reduce waste emissions and other related factors. Therefore, this paper employs data from Chinese A-share-listed companies and customs data from 2001 to 2015 to investigate this relationship. The main findings are as follows: (i) The supply chain concentration negatively impacts the quality of export products, a finding that remains robust after testing. (ii) In some firms, such as those where top executives possess digital-related expertise, the adverse effects of the supply chain concentration are likely mitigated. (iii) The channels through which the supply chain concentration affects export product quality may include firm size, productivity, and supply chain efficiency. (iv) Enhancements in infrastructure resilience, firm structure resilience, and industrial structure resilience through investments in regional fixed assets, overseas subsidiaries, and advancements in industrial structure, respectively, are likely to mitigate the negative impacts of the supply chain concentration. These conclusions may hold significant value for promoting both societal and environmental sustainability.