The invention discloses a three-phase calibrator supporting detection of both an electronic transformer and a traditional transformer. The three-phase calibrator includes an electromagnetic transformer calibrator and an electronic transformer calibrator, the device can accurately reflect the characteristics of an electronic transformer and a traditional transformer in a working state, and comparedwith an existing calibrator, the three-phase calibrator provided by the invention can overcome the defects of low efficiency, repeated wiring and the like in a single-phase method, has the advantagesof being close to an actual operation condition, having good compatibility and having high detection efficiency, and thus can ensure fairness and equity of electric energy metering.