Objective To study the relationship between mental health status of migrant children with self-esteem level. Method By using chester sampling method,858 migrant children from 4 schools in Shenyang were surveyed with mental health test(MHT) and self-esteem scale (SES). Results There were mental health problems in migrant children.The study anxiety was the highest,the incidence rate was 48.50%.There was difference between the self-esteem level of healthy children with unhealthy children.The mental health problems had negative correlations with self-esteem level(P all ＜0.01). Conclusions There are mental health problem in migrant children.The study anxiety and self-blame tendency are primary problems.The mental health problems are correlation with self-esteem level.