Parental burnout is a state that parents feel exhausted in their parental role. Although past research has examined concurrent correlates of parental burnout, the impacts of parental burnout on adolescent development over time remain largely unknown. The current study explored the indirect mechanisms linking mothers' parental burnout to adolescents' later internalizing and externalizing problems through maternal hostility among Chinese families. Using a sample of 606 adolescents (51.5% boys; M[subscript age] = 12.89 years old) and their mothers (M[subscript age] = 38.50 years old), this three-wave longitudinal study showed that mothers' parental burnout was predictive of adolescents' perceptions of their mothers' parental hostility over time, which were in turn related to adolescents' later internalizing and externalizing problems. Moreover, mothers' parental burnout was directly related to adolescents' later externalizing problems. Taken together, parental burnout played a role in adolescents' internalizing and externalizing problems over time through increased parental hostility. These findings underscore the importance of parental burnout on parenting behavior and adolescent adjustment.