As environmental problems are becoming increasingly severe, the environmental protection behavior of an enterprise directly affects the evaluation of customers towards the enterprise. Taking A-share manufacturing companies listed in China as the sample, this study investigates the impact of environmental information disclosure on customer stability. The results show that environmental information disclosure positively affects customer stability. Moreover, hard environment information has a stronger effect on enhancing customer stability due to its higher information quality. Mechanism tests indicate that environmental information disclosure exerts three effects on customer stability, namely “information effect”, “governance effect” and “reputation effect”. Environmental information disclosure can increase information transparency and improve corporate governance and firm reputation, thereby enhancing customer stability. Heterogeneity analysis demonstrates that environmental information disclosure has a more significant promoting effect on customer stability in enterprises with higher media attention. This study validates the benefits of environmental information disclosure from the perspective of customers and offers insights for emerging economies to enhance their environmental information disclosure systems.