The rapid development of high technology in modern social production and the expansion of engineering activities have gradually raised the issue of engineering ethics, especially the environmental ethical challenges faced by engineers and how to cultivation their sense of environmental ethical responsibility are the key links to achieve sustainable human development. Therefore, based on the introduction of related concepts about engineering ethics, engineers and environmental ethics, this paper explores the challenges faced by engineers in environmental ethics from four aspects, and proposes that the above challenges can be met by enhancing the awareness of environmental ethics, improving the norms of engineering activities about environmental ethical, and establishing the environmental ethical dimension of engineering evaluation.