〔Abstract〕 Objective To investigate the influence of scar diverticulum (PCSD) formation in cesarean section. Methods A total of 114 patients who were diagnosed with PCSD by ultrasound between January 2018 and December 2020 at Longchuan maternal and child health hospital were used as the observation group, and 93 patients who had no diverticula after undergoing cesarean section during the same period were used as the control group. Their clinical data were retrospectively analyzed, and the influence of diverticula on uterine scar was analyzed by logistic regression. Results The data of two groups were compared in terms of number of cesarean sections, premature rupture of membranes, prolonged labor, number of fetuses, increase in body mass, elective surgery, uterine position, anemia (P < 0.05); Multiple logistic regression analysis showed that number of cesarean sections, premature rupture of membranes, prolonged labor, number of births ≥ 2, and increase in body mass ≥ 20 kg were independent risk factors for PCSD formation. Conclusion Number of cesarean sections, premature rupture of membranes, prolonged labor, number of fetuses ≥ 2, and increase in body mass ≥ 20 kg are independent risk factors for PCSD formation, and prevention and treatment of uterine scar diverticulum require attention to the above indicators.