This study investigates the impact of non-controlling shareholders' network on corporate excess goodwill using Chinese publicly listed companies from 2007 to 2020. We find that a stronger centrality of non-controlling shareholders' network leads to a significant decrease in excess goodwill resulting from mergers and acquisitions. This implies that the non-controlling shareholders’ network has a significant inhibitory effect on the occurrence of goodwill bubbles. Mechanism analysis finds that non-controlling shareholders' network can inhibit excess goodwill thorough information effect, resource effect, and governance effect. Furthermore, this inhibitory effect is attributed to pressure-resistant institutional investors and individual investors, and is more pronounced in firms located in less developed intermediary market and legal system environment, as well as firms with lower audit quality. In summary, the non-controlling shareholders' network plays a positive role in curbing excess goodwill in listed companies.