Three-phase common-box insulator assembly and GIS

The invention relates to a three-phase common-box insulator assembly and a GIS. The three-phase common-box insulator assembly comprises three-phase center inserts arranged in a shape like a Chinese character'pin ', a flange and an insulating part arranged between the center inserts and the flange, electrodes are integrally poured in the insulating part and correspond to the center inserts, and the electrodes and the corresponding center inserts are correspondingly arranged in the radial direction. The electrode comprises an arc-shaped part which corresponds to the central insert and extends in the circumferential direction of the insulating part, and further comprises connecting parts, the connecting parts are located on the side, opposite to the central insert, of the arc-shaped part, and radial through holes corresponding to the connecting parts are formed in the flange; the connecting part is used for being connected with an electrification display wiring body penetrating into the radial through hole when