Green innovation in manufacturing enterprises and digital transformation

China's manufacturing industry accounts for the largest share of added value in the world, but there are problems such as high energy consumption and low efficiency. Digital transformation is crucial to green innovation in manufacturing and thus green transformation. Therefore, this paper selects listed manufacturing companies from 2013 to 2020 as the research object to build an empirical model to test whether digital transformation can improve the quality of enterprise green innovation. The findings are as follows: First, digital transformation can promote the improvement of green innovation efficiency and innovation quality of listed companies, but also inhibit the application of green utility model patents; Second, the digital transformation of listed companies has an important impact on the green innovation output of their subsidiaries. On the one hand, it increases the application of green invention patents of subsidiaries, and on the other hand, it significantly inhibits low-quality green patents. Third, digital transformation promotes the improvement of green innovation efficiency and the increase of green output by influencing enterprises' R&D investment.