Objective To summarize and analyze the clinical efficacy of negative pressure suction cup in the treatment of young children (≤ 6 years old) with pectus excavatum. Methods The relevant clinical medical records of the children with pectus excavatum who received negative pressure suction cup treatment in our hospital outpatient department from May 2019 to January 2023 were collected. The age, sex, type, severity, depth of depression, duration of use and prognosis of children with pectus excavatum were retrospectively analyzed. Results Finally 100 children were treated with negative pressure suction cups according to the doctor’s advice for at least 3 months. The 99 patients was effective, the effective rate was 99%, the excellent and good rate was 52.00%, and the complication rate was 8.00%, After treatment, the Haller index and the depth of sternal depression were reduced compared with those before treatment (P<0.001), and there was no statistical difference in the effective rate and excellent rate between different genders, different ages, different types of pectus excavatum, or different severity (P＞0.05). Conclusion Negative pressure suction cup is safe and effective in the treatment of youngchildren (≤ 6 years old) with pectus excavatum, and the correction effect has nothing to do with gender, type and severity .