This study explores the positive effect of green relationship learning on green innovation performance in the Taiwanese manufacturing industry. The research also discusses the mediation effect of corporate environmental ethics between green relationship learning and green innovation performance. With the increasing trend of environmentalism, green innovation becomes a critical factor for companies to obtain sustainable development. This study proposes the three hypotheses. First, this research asserts that green relationship learning can facilitate corporate environmental ethics. Second, the study posits that corporate environmental ethics has a positive association with green innovation. Third, this study argues that corporate environmental ethics is a mediator between green relationship learning and green innovation. This study is conducted in the Taiwanese manufacturing industry to test the above research hypotheses. The results show that green relationship learning has a positive effect on corporate environmental ethics which affects green innovation performance positively. In addition, the results verify that corporate environmental ethics is a mediator between green relationship learning and green innovation performance.