The invention provides a method for judging the consistency of the conversion ratio and the actual conversion ratio of a 10 kV line electric energy meter system. The method comprises the following steps: S1, collecting the line diurnal meter bottom reading of the line, the metric diurnal meter bottom reading of the metric change, the special diurnal meter bottom reading, the line change relation and the conversion ratio of the electric energy meter system; S2, preprocessing the collected data; S3, using a BP-Adaboost Algorithm to construct a Neural Network; S4, according to the data in the steps S1 and S2, calculating the characteristic quantity of the 10kV transmission line input neural network, and normalizing the characteristic data; S5, inputting the normalized characteristic data in the step S4 into the neural network established in the step S3, and outputting the judgment result; 6, according to the output value, determining an electric energy met in which the transformation ratio of the system in the circuit is consistent with the actual transformation ratio; S7, replacing the problematic watt-hour meter in which the system conversion ratio is consistent with the actual conversion ratio. The invention can greatly reduce the manpower and material resources, effectively, quickly and accurately solve the problem of the consistency between the transformation ratio of the electric energy meter system and the actual transformation ratio, and improve the quality of the line loss calculation data and the line loss treatment efficiency.