The utility model relates to a complete three-phase box type voltage transformer test device for a global information system (GIS). The device comprises insulated sleeves and a connecting sleeve connected with the lower ends of the insulated sleeves, wherein conductive rods are arranged in the insulated sleeves; the conductive sleeves are connected with crank as through electric connectors; strut shielding covers are arranged between the insulated sleeves and the conductive rods; the connecting sleeve is a four-way connecting sleeve; three round openings are formed on the top of the four-way connecting sleeve; the three insulated sleeved, the three conductive rods, the three electrical connectors, the three crank arms and the three strut shielding covers are the same; and the three round openings on the top of the four-way connecting sleeve are connected with the three insulated sleeves respectively. In the utility model, the whole test can be accomplished at one time by mounting, detaching, moisture processing, vacuumizing and sulfur hexafluoride filling, so the working efficiency is increase, the cost is lowered and air pollution is relieved.