The invention discloses a three-phase capacitor type voltage transformer error integral verification method. The method includes the following steps that: a voltage regulator, an exciting transformer and a reactor are connected with one another in sequence, and a standard PT and three-phase CVTs are connected in parallel with the output end of the reactor; the secondary output high-voltage end of the standard PT is connected with the a interface of a three-phase multifunction calibrator; the secondary output low-voltage end of the standard PT is connected with the x interface and k interface of the three-phase multifunction calibrator; the secondary output high-voltage ends of the three-phase CVTs are connected with the secondary output high-voltage end of the standard PT simultaneously; the secondary output low-voltage ends of the three-phase CVTs are connected with the Da interface, Db interface and Dc interface of the three-phase multifunction calibrator respectively; the primary low-voltage end of the standard PT and the primary low-voltage ends of the three-phase CVTs are grounded a one-point manner respectively; and voltage boosting is adjusted, and the error value of the three-phase CVT to be measured is obtained from the output result of the three-phase multifunction calibrator. With the three-phase capacitor type voltage transformer error integral verification method of the invention adopted, the error performance of the CVT under an actual running state can be detected accurately, and the number of times of voltage boosting can be decreased, and the safety of equipment can be increased; and data can be automatically recorded and stored, so that test efficiency can be improved.