To analyze the value of the pelvic floor ultrasound parameters of parturients for diagnosing their postpartum stress urinary incontinence (PSUI), and to evaluate the rehabilitation therapy efficacy of the parturients. Methods: 155 parturients with PSUI (in group A) and 155 healthy parturients (in group B) in the department of reproductive and gynecology of the hospital were selected as the research subjects from July 2020 to July 2023. The parturients in group A were treated with Kegel rehabilitation exercise. According to whether the parturients with effectiveness after Kegel rehabilitation exercise or not, the parturients were divided into 123 parturients with effectiveness in group A1 and 32 parturients without effectiveness in group A2. Pelvic floor ultrasound examination was adopted to compare the various pelvic floor ultrasound parameters values and the internal urethral orifice funnel formation status of the parturients between group A and group B and between group A1 and group A2. Multivariate logistic regression was applied to analyze the influencing factors of the rehabilitation therapy efficacy. Receiver operating characteristic (ROC) curve was performed to analyze the evaluative efficacy of the bladder-related parameters of the parturients for their PSUI. Results: The values of the bladder related parameters evaluated by the pelvic floor ultrasound of the parturients before treatment in group A were significantly higher than those of the parturients in group B. The rate of the internal urethral orifice funnel formation of the parturients in group A was significantly higher than that of the parturients in group B. The total effective rate of the parturients in group A after Kegel rehabilitation exercise treatment was 79.4%. Before treatment, the values of the pelvic floor ultrasound parameters of the parturients in  group A2 were significantly higher than those of the parturients in group A1, and the rate of the internal urethral orifice funnel formation of the parturients in group A2 was significantly higher than that of the parturients in group A1 (all P<0.05). Multivariate logistic regression analysis showed that the increase of the pelvic floor ultrasound parameters values were the independent risk factors of the efficacy of the parturients with PSUI after Kegel rehabilitation exercise. ROC analysis showed that the ultrasound related parameters of the parturients with PSUI had certain value for evaluating the efficacy of their Kegel rehabilitation exercise, and the area under the curve of the ultrasound related parameters of the parturients for evaluating the efficacy of the Kegel rehabilitation exercise was 0.683-0.790. Conclusion: The pelvic floor ultrasound-related parameters values of the parturients with PSUI are increased abnormally, and which have certain values for evaluating the rehabilitation treatment efficacy of the parturients.