The Positive Psychological Capital Questionnaire (PPQ) and Life Satisfaction Scale (SWLS) were used to conduct a questionnaire survey among 1076 college students of South China Agricultural University to explore the relationship between parents' marital relationship, life satisfaction and college students' psychological capital. The results show that: (1) Parents' marital relationship is significantly positively correlated with college students' psychological capital, and positively predicts psychological capital; (2) Life satisfaction is significantly positively correlated with psychological capital, and positively predicts psychological capital; (3) Life Satisfaction plays a partly mediating role in the influence of parents' marital relationship on the psychological capital of college students.