This paper explores the role of environmental NGOs in global ecological sustainability and environmental management through an empirical approach. Multiple case studies of environmental NGOs have demonstrated positive benefits in promoting environmental regulations, popularizing environmental knowledge, and guiding ecological conservation and restoration. Environmental NGOs around the world, with their public participation and advocacy of environmental protection, not only play an important role in safeguarding biodiversity and preventing environmental damage but also provide opportunities for the public to participate in environmental management. On this issue, this paper also has an in-depth discussion on the problems existing in environmental NGOs in many fields such as environmental education, financing, and implementation consistency, and is willing to provide suggestions for the further improvement of global environmental management strategies, and then promote the better realization of global sustainable development goals.