The utility model provides an electrified calibration system of voltage transformer, is including inspection appearance, optical sensing head, the electromagnetic shielding housing body. Standard voltage transformer adopts coaxial capacitance ware partial pressure structure, and standard voltage transformer passes through the guide arm and links to each other with the binding clip. The optical sensing head is continuous with the two poles of the earth board of coaxial capacitance ware respectively, the internal portion of electromagnetic shielding housing is arranged in to coaxial capacitance ware, optical sensing head, and standard voltage transformer measuring -signal inspects the appearance to link to each other together after passing through signal processing, photoelectric conversion. The utility model relates to an electrified calibration system of voltage transformer for the standard voltage transformer of electromagnetic type, has reduced its volume and cost of transportation greatly. Digital output is direct simultaneously transferes the check gauge to output signal, has reduced the link that is transformed into analog signal data signal.