<p>The increasing complexity of career choices and the constantly evolving social environment have brought the interaction between early adolescents’ career adaptability and prosocial behavior to the forefront of research. While this reciprocal relationship remains relatively unexplored, it offers significant promise for advancing our understanding of the reciprocal mechanisms between career adaptability and prosocial behavior, providing empirical evidence to inform targeted interventions for early adolescents’ career development and social integration. This study applied a cross-lagged panel model to study the reciprocal relationship between career adaptability (including concern, confidence, control, and curiosity) and prosocial behavior (including relationship, altruism, commonweal-social rule, and personal traits) in early adolescents. A cohort of 585 seventh graders completed career adaptability and prosocial behavior scales at two time points, one year apart. Findings indicated reciprocal relationships between career confidence and personal trait prosocial behavior, career curiosity and personal trait prosocial behavior, as well as between career confidence and commonweal-social rule prosocial behavior. Specially, career confidence and curiosity positively were positive predictors of personal trait prosocial behavior, while personal trait prosocial behavior positively predicted both career confidence and curiosity. Career confidence positively predicted commonweal-social rule prosocial behavior, and commonweal-social rule prosocial behavior positively predicted career confidence. The implications and limitations of these findings are also considered.</p>