This meta-analysis aimed to systematically assess the mental health status of new generation of migrant workers. 20 literature researching the mental health during the 2007 to 2015 used the Symptom Check list 90(SCL-90). The results showed that the mean effect size of all the factors concentrated between 0.144 and 0.328,which indicates that the mental health status of the new generation of migrant workers is lower than the national norm,but it was not serious as expected,the most serious factors areShorror and anxiety . The mental health status remained steady in the duration of the study . There is no significant difference between male and female in their mental health status. The marriage status have no significant effect on the mental health. The migrant workers working in the in the interior regions of China suffer more serious psychological problems than workers in developed areas on the coast．Sensitivity showed good stability in this study and no significant publication bias analyses was found.