Migrant children’s perceived social support status and whether migrant children’s perceived social support moderate the impact of stress on psychological adaptation were explored. 334 migrant children, 237 urban children and their parents were asked to complete the ASLEC, PSSS, and CBCL. Results indicated migrant children’s PSSS scores were significantly lower than urban children. Hierarchical multiple regression analysis suggested social support plays moderating role in the relation between stress and psychological adaptation, which suggested that social support plays protective role in the migrant children’s psychological adaptation.