This paper examines the impact of ESG (Environmental, Social, and Governance) on cross-border M&A activities and outcomes from the perspective of emerging economy firms. Using cross-border M&A events of Chinese acquirers between 2009 and 2021 as a sample, we employ logistic regression and multiple linear regression for analysis and conduct robustness tests. The study finds that: (1) Acquirers with lower ESG ratings are more likely to choose other developing countries for M&A, and the home country’s policy enforcement significantly positively moderates this relationship; (2) Lower ESG ratings of acquirers have a significant negative impact on their M&A performance, while the country distance between China and the host country does not have a significant moderating effect on this relationship. These results suggest that under strong home country policy enforcement, emerging economy firms are pressured by their home country’s ESG ratings to choose host countries with lower ESG requirements for M&A. However, this approach is like “drinking poison to quench thirst”; while selecting an “ESG haven” can temporarily reduce ESG rating pressure, low ESG ratings ultimately result in lower M&A performance.