Objective To investigate the clinical effect of pelvic floor functional magnetic stimulation combined with Kegel exercise in the treatment of postpartum stress urinary incontinence (SUI). Methods A total of 136 cases of postpartum mild to moderate SUI patients in our hospital from July 2018 to June 2019 were selected as the research objects and divided into the study group and the control group according to the random number table method, with 68 cases in each group. The study group received pelvic floor functional magnetic stimulation (twice a week) combined with Kegel exercise (2 months), while the control group received Kegel exercise (2 months). The improvement of pelvic floor muscle strength and the clinical effect and recurrence of urinary incontinence were compared between the two groups. Results The normal rate of pelvic floor muscle strength in the study group was higher than that in the control group, and the difference was statistically significant (P<0.05). The total effective rate of the study group was higher than that of the control group, and the difference was statistically significant (P<0.05). The recurrence rates of the study group at 3 and 6 months after treatment were lower than those of the control group, and the differences were statistically significant (P<0.05). Conclusion Pelvic floor functional magnetic stimulation combined with Kegel exercise can significantly improve the pelvic floor muscle strength of postpartum mild and moderate SUI, relieve the symptoms of urinary incontinence, with less adverse reactions and low recurrence rate, which is worthy of clinical promotion and application.