Objective To explore the prevention and treatment effect of pelvic floor muscle exercise during pregnancy combined with postpartum pelvic floor function rehabilitation therapy on postpartum pelvic floor dysfunction in women. Methods From January 2019 to June 2020, women in our hospital's obstetrics outpatient department for regular obstetric checkups were selected, which ultrasound confirmed it was a singleton full-term delivery. The cases of stillbirth, fetal malformation and placenta previa were excluded. A total of 316 cases met the inclusion criteria and were randomly divided into the observation group and the control group, with 131 cases in the observation group and 185 cases in the control group. Observation group started regular pelvic floor muscle Kegel exercises from 12 weeks of gestation,and accepted pelvic floor rehabilitation therapeutic treatment from 42 days to six weeks postpartum. We summerized the pelvic floor function tests results, pelvic organ prolapse (POP) and stress urinary incontinence (SUI) situation of both groups in 42 days, 3 months and 6 months postpartum. Results The general information of the observation group and the control group showed that there were no statistical differences in age, gestational age of delivery and average weight of newborn (P>0.05). The pelvic floor function 42 days after delivery of the two groups was tested and compared, duration of vaginal contraction and class Ⅱ muscle fiber strength of the observation group [(85.24±22.19) cmH₂O] was significantly higher than that of the control group [(74.14±19.94) cmH₂O], and the difference was statistically significant (P＜0.05). Class I muscle fiber strength, duration of vaginal contraction and class Ⅱ muscle fiber strength were observed at 3 months postpartum, those of observation group[(76.41±16.42) cmH₂O; (4.35±1.78) s; (94.15±18.25) cmH₂O] were significantly higher than that in the control group [(62.45± 17.55) cmH₂O; (3.89±1.52) s; (88.55±18.36) cmH₂O], and the difference were statistically significant (P<0.05). At 6 months postpartum, class I muscle fiber strength, vaginal contraction duration and class Ⅱ muscle fiber strength in observation group [(79.56±15.78) cmH₂O; (5.46±2.01) s; (99.78±23.47) cmH₂O] were significantly higher than that of the control group [(67.63±14.45) cmH₂O; (4.13± 1.45) s; (90.16±18.75) cmH₂O], and the difference were statistically significant (P<0.05). Comparison of the incidence of POP and SUI between the two groups showed that the incidence of SUI in the observation group at 42 days postpartum (28.24%) was significantly lower than that in the control group (35.14%), the difference was statistically significant (P＜0.05). The incidences of POP and SUI in the observation group at 3 months postpartum (18.32%; 13.74%) were significantly lower than that of the control group (22.70%; 17.83%), the difference were statistically significant (P＜0.05). The incidences of POP and SUI in the observation group at 6 months postpartum (0.00%; 0.07%) were significantly lower than that of the control group (8.10%; 11.89%), the difference were statistically significant (P＜0.05). Conclusion Pelvic floor muscle exercise during pregnancy combined with postpartum pelvic floor function rehabilitation therapy can significantly improve postpartum pelvic floor function and significantly reduce the incidence of postpartum pelvic floor dysfunction diseases.