Based on the data of China's A-share listed companies from 2008 to 2021, this paper examines the impact of chain directors with green experience on corporate environmental protection investment and concludes that chain directors with green experience can significantly increase corporate environmental protection investment, which is still valid after the robustness test and dealing with the endogeneity problem. The impact mechanism test finds that the green experience chain board increases the environmental investment of enterprises through two channels: increasing the environmental awareness of corporate executives and alleviating the corporate financing constraints. When a company is the subject of considerable external scrutiny, the positive impact of green experience on the company's environmental protection investment will be amplified. From the perspective of enterprise characteristics, state-owned enterprises and enterprises in the eastern region have larger internal capital scale and stronger turnover capacity, which is conducive to the promotion of environmental protection investment by directors with green experience; compared with enterprises without environmental penalties, enterprises with environmental penalties face greater pressure of environmental regulation, which prompts directors with green experience to play a more active role in increasing environmental protection investment.