In a study of 80 patients suspected of ovarian torsion and necrosis admitted to our hospital between January and December 2023, we analyzed the results of abdominal and vaginal ultrasounds with surgical diagnoses as the reference. Of the 80 cases, 74 were confirmed as ovarian torsion, accounting for 92.50%, while the remaining diagnoses included ruptured corpus luteum cysts, periapendiceal abscesses, and ruptured ectopic pregnancies, each with 2 cases. Abdominal ultrasound identified 63 cases of ovarian torsion and 17 cases of non-ovarian torsion, whereas vaginal ultrasound identified 73 cases of ovarian torsion and 7 cases of non-ovarian torsion. The sensitivity, specificity, and accuracy of abdominal ultrasound were 82.43%, 66.67%, and 78.75%, respectively, while those of vaginal ultrasound were 94.59%, 50.00%, and 91.25%. Although there was no statistical difference in specificity between the two methods (P > 0.05), vaginal ultrasound demonstrated significantly higher sensitivity and accuracy compared to abdominal ultrasound (P < 0.05). Thus, vaginal ultrasound is a more reliable diagnostic tool for ovarian torsion, providing valuable information for clinicians and improving diagnostic accuracy.