【Abstract】Objective To explore the role of bionic midwifery technique in natural childbirth. Methods 330 natural childbirth puerpera were divided into observation group (218 cases) and control group (112 cases). The observation group was treated with KCB II balloon midwifery instrument to expand the cervix and vagina. The control group did not use KCB II balloon midwifery instrument. The maternal labor time, delivery mode and delivery time were observed. Results The first and second labor time obviously shortened, natural births increased and cesarean section rate reduced of observation group compared with that of control group. The neonatal Apgar score, 1 minute episiotomy, 2 hours postpartum haemorrhage of observation group was statistically different from those of control group (.P＜0.05). Cervical tearing rate, puerperal infection, postpartum urinary retention in the two groups had no statistically significant difference（P＞0.05）. Conclusion Airbag bionic midwifery technique can obviously shorten the labor, increase the natural births and reduce cesarean section rate.