The utility model discloses a superfrequency sensor for GIS partial discharge detector, include: can shield external signal's shielding case, its bottom surface is equipped with the opening, is equipped with the cable connector with the external equipment butt joint on this shielding case, insulating medium base plate, it sets up in the shielding case and is corresponding with the opening of shielding case bottom surface, two are used for detecting the discharge paster of signal of GIS, and it is mirror symmetry formula ground and sets up on the same surface of medium base plate, the curve of the interior border of paster for being the exponent form gradual change, and the width of paster head is lighter than the width of its afterbody, an afterbody electricity is connected that is used for transmission signal's coaxial line, the one end of sinle silk and the one end on its internal shield layer all are connected with the cable connector electricity in it, in it the other end and its internal shield layer of sinle silk the other end respectively with two pasters . its detection bandwidth is big, sensitivity is high, can detect the littleer produced signal of partial discharge among the GIS.