The invention provides a DC voltage transformer field calibration method, which comprises the steps of: carrying out a voltage division ratio test on a DC voltage divider body of a tested DC voltage transformer, measuring an actual linearity of the DC voltage divider body of the tested DC voltage transformer, and comparing the actual linearity with a preset linearity; calculating an actual rated output voltage of a low-voltage arm of the DC voltage divider body of the tested DC voltage transformer if the actual linearity is greater than the preset linearity; and regarding the actual rated output voltage of the low-voltage arm of the DC voltage divider body of the tested DC voltage transformer as a rated input voltage of all secondary measuring systems of the tested DC voltage transformer,and calculating error data of each secondary measuring system. According to the DC voltage transformer field calibration method, only one test of the DC voltage divider body of the tested DC voltage transformer and multiple error tests of the secondary measurement systems of the tested DC voltage transformer are conducted, thus the on-site calibration work efficiency can be greatly improved, and potential safety hazards caused by long-time full-load operation of a DC high-voltage test power supply are avoided.