Child maltreatment is a pathogenic relational experience that creates risk for physical and psychological health difficulties throughout the lifespan. The Reminiscing and Emotion Training intervention (RET) was developed to support maltreated children’s healthy development by improving parenting behavior among maltreating mothers. Here, we evaluated whether RET was associated with reductions in child welfare reinvolvement over the course of two years. The sample included 165 maltreating and 83 nonmaltreating mothers and their 3- to 6-year-old children who were enrolled in a longitudinal randomized controlled trial of RET. Maltreating mother–child dyads were randomly assigned to receive RET or an active control condition (community standard [CS]). Nonmaltreating dyads were a separate control group (nonmaltreating control). Comparing CS and RET dyads, there was a significant effect of RET on frequency of child welfare reinvolvement (substantiations and unsubstantiated assessments) during the two years following dyads’ enrollment in the intervention, t(163) = 2.02, p < .05, Cohen’s d = 0.32. There was a significant indirect effect of RET on child welfare reinvolvement through maternal sensitive guidance during reminiscing [95% CI −0.093, −0.007]. Results provide support for the efficacy of RET in preventing child welfare reinvolvement.