The line-transformer-meter topology anomaly is a major reason for unreasonable statistical value of line loss rate. Taking into account that the equipment involved in the part of lines is more and abnormal situation is complex, it is very difficult to find out the reason only by on-site inspection method. To overcome this problem, a method of line-variable-table topology anomaly identification for cable distribution network connection is presented in this paper. To ensure the objectivity of analysis, the influence of topology anomaly on the line loss rate is analyzed based on the calculation formula of the line loss rate, and the corresponding topology anomaly types are refined for the single-loop wiring and bi-directional wiring. To improve the efficiency of site investigation work, the relationship between the actual value and the statistical value of line loss rate under different types of anomalies is deduced, and a method of identifying topological anomalies is proposed to predict the anomalies before the on-site inspection. Finally, a numerical example is presented to verify the validity of the method. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 52091418005N) and National Natural Science Foundation of China (No. 51507100).