Public health service is related to people's life safety and health, and its accessibility will have an important impact on the employment quality of migrant workers. Combined with the CMDS（2018 ）special survey carried out by the National Health and Health Commission, systematically investigated the impact of public health services on the employment quality of migrant workers. The research shows that the improvement of public health services can improve the employment quality of migrant workers, and the conclusion is still robust and reliable after the instrumental variable method and propensity score matching test. Heterogeneity analysis shows that public health services are more significant in improving the employment quality of cross-province migrant workers. Mechanism analysis shows that the public health service level mainly affects the employment quality of migrant workers through two paths health level improvement and city sense of belonging. The research results helps to further understand the importance of public health services to improve the employment quality of migrant workers, and provides useful references for the government to focus on public health services, promote the equalization of public services for the floating population, and rationally formulate ways to improve the employment quality of migrant workers.