Objective: To investigate the effect of extended Kegel exercise combined Bobath ball training on postpartum pelvic floor rehabilitation for parturients with a second vaginal birth. Methods: 150 multiparas, full-term, single fetus, second vaginal birth were randomly divided into observation group and control group with 75 cases each，the control group was given routine postpartum care，and began postpartum pelvic floor muscle recovery exercises from 2 days after birth. The observation group conducted extended Kegel exercise combined with Bobath ball training guidance on the basis of routine postpartum care. Observing the compliance of pelvic floor rehabilitation exercise and pelvic floor muscle strength rehabilitation effect between the two groups at 6 months after postpartum；Observing the incidence of pelvic organ prolapse（S-POP-Q） and urinary incontinence（ICI-Q-SF）between the two groups at 1 day and 12 months after postpartum；Female sexual function was evaluated at 6 months postpartum and 12 months postpartum，and the recovery of sexual function was compared between the two groups. Results: The pelvic floor functional exercise compliance and pelvic floor muscle strength in observation group were significantly higher than those of the control group（P＜0.01）；There were no statistically significant difference in the incidence of urinary incontinence and pelvic organ prolapse between the observation group and the control group at 1 day after postpartum(P＞0.05)，but the incidence of urinary incontinence and pelvic organ prolapse were lower in the observation group than those in the control group at 12 months after postpartum(P<0.05)；6 months after delivery, sexual dimension score among FSFI scores of all dimensions in the observation group was higher than that in the control group(P＜0.01)，and no significant difference in other dimension between the two groups(P＞0.05)，12 months after delivery, FSFI scores in all dimensions were higher than those in the control group(P<0.05).However, the sexual pain dimension score was lower than that of the control group(P<0.01). Conclusion: Extended Kegel exercise combined with Bobath ball training can improve the compliance of pelvic floor muscle exercise of parturients with a second vaginal birth，reduce urinary incontinence and pelvic organ prolapse，improve postpartum pelvic floor function and the quality of life, rehabilitation effect is significant.