To explore the application effect of non-invasive ear molding device in children with congenital auricular deformity at different ages. Methods A total of 140 children with congenital auricular deformities admitted to our hospital from January 2022 to January 2023 were selected as the research objects. According to the age of the children, they were divided into <1 month old group (n =60) and 1-3 months old group (n =80). The two groups of children were treated with non-invasive ear molding device. The clinical efficacy, auricular morphology, wearing time of auricular correctors, complications and recurrence were compared between the two groups. Results The total effective rate of treatment in the <1 month old group was 100.00%, which was higher than 90.00% in the 1-3 months old group, the difference was statistically significant (P <0.05). The index values of morphological ear length, facial ear length, morphological ear width and facial ear width in the <1 month old group were higher than those in the 1-3 months old group, and the index value of vertical distance between cranium and ear was lower than that in the 1-3 months old group, with statistically significant differences (P <0.05). There was no significant difference in the cranial ear angle betw een the two groups after treatment (P >0.05). The wearing time of children in the <1 month old group was lower than that in the 1-3 months old group, and the difference was statistically significant (P <0.05). There was no significant difference in the incidence of complications between the two groups (P >0.05). Conclusion For children with congenital auricle deformity, non-invasive ear molding device has a good application effect, the younger the child, the shorter the treatment time required, and the better the treatment effect obtained.