Environmental innovation is an important measure to achieve green development. In order to gain a deeper understanding of the research progress on environmental innovation, this study collected 615 papers related with environmental innovation from 2007 to 2018 in the Web of Science database. The literatures were scientifically and systematically analyzed by means of bibliometrics and content analysis, and the integrated framework for environmental innovation research was built. The results showed that the research foundation of environmental innovation focused on three aspects: basic theory, competitive advantage, and environmental policy tools. Its research hotspots contained the performance evaluation of environmental innovation, the relationship between environmental innovation and enterprise performance, and the driving factors of environmental innovation. Finally, based on the analysis results, this study outlined the future research direction for environmental innovation.