Abstract: As an important form for enterprises to integrate external resources, cooperative organizations hold positive significance for driving collaborative innovation and cultivating new quality productive forces. Based on data from A-share listed companies from 2009 to 2022, this paper empirically examines the impact of strategic alliances on corporate green innovation. The findings reveal that strategic alliances significantly promote corporate green innovation, primarily through alleviating financing constraints, enhancing human capital, and facilitating knowledge flow. Moderating effects indicate that this promoting effect is more pronounced when alliance partners are private enterprises or government institutions, or when the firm exhibits a high degree of digital transformation, possesses high-quality internal controls, or is located in regions with strong intellectual property protection or stringent environmental regulations. Further analysis shows that strategic alliances drive green ambidextrous innovation, thereby enhancing both corporate environmental performance and market competitiveness. This study provides a new perspective for enterprises to promote green innovation and offers policy implications for the construction of cooperative organizations and their role in achieving high-quality development.