Objective To explore the severity of anxiety and depression in international military students in China and its relationship with perceived social support. Methods With cluster sampling, 148 international military students from a military university were investigated with self-compiled demographic questionnaire, perceived social support scale (PSSS), self-rating anxiety scale (SAS) and self-rating depression scale (SDS). The relationship between anxiety, depression and perceived social support was explored using multiple linear regression analysis (Stepwise regression). Results A total of 148 questionnaires were sent out, and 135 valid questionnaires were collected, with an effective rate of 91.2%. The average score of PSSS of the 135 students was 57.89±14.37. The average score of SAS was 48.33±9.21, and 47 students (34.8%) had mild anxiety or above; and the SAS score of the females was significantly higher than that of the males (P<0.01). The average score of SDS was 53.12±9.03, and 82 students (60.7%) had moderate depression or above. Multiple linear regression analysis revealed that the lower the perceived social support level, the more serious the anxiety and depression (β=-0.211, P=0.016; β=-0.462, P<0.01). Conclusion The anxiety and depression of international military overseas students in China are serious, and the severity is related to the level of perceived social support.