This study performs a meta-analysis on the eco-innovation/SMEs` sustainable performance relationship on a sample of 134841 SMEs covering 99 studies and 233 study effects. Employing a psychometric meta-analytic approach with a random-effects model, we find that the average impact of eco-innovation on SMEs` sustainable performance is positively significant but moderate. Notably, we find that eco-process, eco-product, eco-organizational, and eco-marketing innovations positively influence SMEs` sustainable performance, but the impact of eco-organizational innovation is the strongest. Findings further reveal that eco-innovation positively influences economic, social, and environmental performance, but its effect on social performance is the largest. Moreover, our findings reveal that contextual factors, including industry type, culture, industry intensity, global sustainable competitive index, and human development index, moderate the eco-innovation/SMEs` sustainable performance relationship. Lastly, methodological factors, namely sampling technique, study type, and publication status, account for study-study variance.  Based on these findings, we delineate several implications for future research and practice.