The invention relates to a method for evaluating voltage transformer operation. The method comprises the following steps of: 1) using a remote metering device online monitoring system to acquire the original data of a field voltage transformer and upload the original data to a data server of a host PC; 2) using the host PC to classify the original data and establish a mathematic model of voltage transformer operation evaluation according to the classified original data; and 3) according to the established mathematic model of voltage transformer operation evaluation, evaluating the voltage transformer operation to obtain a final health index HI of the voltage transformer, predicting the operation trend of the voltage transformer according to the final health index HI and performing early warning. Compared with a method in the prior art, the method has advantages of a scientific and reasonable property, a large number of researched objects, a wide coverage, and good systemaltization and intellectualization.