Background: To explore the sonographic features of singleton angular pregnancy and angular villi or placenta accrete, and to put forward the standard of sonographic refined classification by sonographic score. Methods: The sonographic images and data of 59 cases of angular pregnancy diagnosed by gold standard were retrospectively analyzed, and the sonographic features and scores of different types of angular pregnancy, angular villi or placenta accrete were summarized. A new sonographic fine classification standard was proposed. Results: According to the gold standard, 59 cases of angular pregnancy were divided into three types: type I (endogenous type), type II (exogenous type) and type III (angular and interstitial type). All 59 cases were scored by ultrasound of angular pregnancy type and angular villi or placenta accrete. The median sonographic score of type I, II and III angular pregnancy was 3.0 [2, 3], 6.0 [4, 6] and 6.5 [6, 7.5], respectively, while the best cut-off value of villi or placenta accrete was 2.5, sensitivity 100%, specificity 98.0%. Conclusions: Ultrasonography can accurately diagnose angular pregnancy and provide fine classification, and is also of great application value for angular villi accrete in the first trimester, angular placenta accrete in the second and third trimester and postpartum angular placenta residual accrete.