Objective To explore the effect of dual plane breast augmentation on prognostic effect in the correction of micromastia with breast ptosis. Methods A total of 300 patients with micromastia and breast ptosis admitted to our hospital from January 2019 to January 2024 were selected as the research subjects. According to the random number table method, they were divided into the control group and the observation group, with 150 patients in each group. The control group was treated with conventional breast augmentation, and the observation group was treated with dual plane breast augmentation. The operation related indicators, stress indexes, negative emotions, quality of life and complications were compared between the two groups. Results The intraoperative blood loss, postoperative analgesia time, indwelling drainage tube time and hospitalization time in the observation group were all better than those in the control group (P <0.05). The levels of NE, E, DA and CRP in the observation group after intervention were lower than those in the control group (P <0.05). The scores of SAS and SDS in the observation group after intervention were lower than those in the control group (P <0.05). The incidence of complications in the observation group was 2.00%, which was lower than 8.00% in the control group (P <0.05). Conclusion The application of dual plane breast augmentation in the correction of micromastia with breast ptosis can effectively reduce intraoperative blood loss, improve the stress level and negative emotions of patients, reduce the incidence of complications, and improve the prognosis, which is worthy of clinical application.