In this study, we investigated the impact of social support on the entrepreneurial intention of college students in Beijing (China) and the mediation role of achievement motivation as a link between social support and entrepreneurial intention. We collected 276 effective questionnaires through convenience sampling of college students in Beijing. We found that social support had a significant positive impact on entrepreneurial intention and achievement motivation. Achievement motivation has a significant positive impact on entrepreneurial intention and plays an mediation role in linking social support and entrepreneurial intention. Thus, the study results provide some reference for further improving entrepreneurial practice and education.