Objective: The purpose of this study was to examine the parallel dual mediating effects of positive and negative affects in the relationship between adult attachment and self-compassion of teachers in the early childhood education and care centers. Methods: Two hundred and six teachers participated in the survey who were recruited from kindergarten and child care centers in Seoul and five provinces in South Korea. The data were analyzed by means of frequency, percentages, Cronbach’s reliability coefficient and Pearson’s correlation using SPSS 25.0 and model 4 provided in The PROCESS macro for SPSS 3.4 version. Results: First, the teachers’degrees of anxiety and avoidance in their adult attachment were below the median scores. Those of positive and negative affects, and their self-compassion were close to the median scores. Second, there were parallel dual mediation effects of positive and negative affects between anxious attachment and self-compassion of teachers. Meanwhile, only positive affect had a mediating effect in the path of teachers’avoidant attachment and self-compassion. Conclusion/Implications: This study confirmed that it is important to raise positive affect by lowering each level of anxiety and avoidance in their attachment for teachers in order to improve their self-compassion. It implied the need to provide support for attachment stability enhancement and to pay attention to improve their self-compassion.