The utility model relates to a three-phase common-box GIS electronic-type voltage-current combined mutual inductor, which comprises a three-phase common-box voltage container which passes through a primary conductor, wherein a suspension potential barrel coaxial to a three-phase primary conductor is fixed on the voltage container in an insulating manner; a copper foil layer is coated on the outer wall of the suspension potential barrel; an insulating medium layer is arranged between the suspension potential barrel and the copper coil layer; because a current GIS mutual inductor is used widely, and big waste can be caused because of redesign and re-replacement, the combined mutual inductor disclosed by the utility model is characterized by simple structure and large insulation strength and is improved based on a current mutual inductor; coaxial capacitors are arranged from the primary conductor outwardly step by step; insulating performance is high, reliability and stability are enhanced; simultaneous detection of current and voltage is realized; a structure is impact, precision is high, and cost is reduced greatly.