Research Findings: The present study investigated the potential mediating role of maternal parenting in the intergenerational effects of maternal childhood traumatic experiences (CTEs) on prosocial behaviors of their offspring and examined whether the offspring's sensory processing sensitivity (SPS) moderates this association using a 1-year longitudinal design. A total of 203 preschoolers (M[subscript age] = 4.84, SD = 0.64, 96 girls, at T1) and their mothers participated in this study. Mothers completed questionnaires assessing their own CTEs and parenting toward their offspring, and offspring's SPS and prosocial behaviors. Results indicated that maternal neglect experiences could intergenerationally directly influence their offspring's prosocial behaviors in early childhood ([beta] = -0.20, p = 0.012), as well as having an indirect influence through the mediating role of maternal authoritative parenting ("indirect effect" = -0.09, p = 0.009). Moreover, aesthetic sensitivity (AES) and low sensory threshold (LST), two subdimensions of SPS, moderated the predictive influence of authoritative parenting on preschoolers' prosocial behaviors (AES: [beta] = 0.17, p = 0.005; LST: [beta] = 0.17, p = 0.006). Practice or Policy: The findings provide new evidence for understanding the intergenerational influence of different maternal CTEs on prosocial behaviors among children with different SPS and have implications for alleviating the intergenerational negative effects on children's prosocial behaviors.