The invention relates to a multifunctional fast GIS partial discharge measuring sensor fixing device. The multifunctional fast GIS partial discharge measuring sensor fixing device comprises an outer frame, an upper pressing plate, side fastening plates, pull strips and a supporting rod. The outer frame is open and comprises a lower bottom plate, a left side plate, a right side plate, a front side plate and a back side plate. The upper pressing plate is connected to the interior of the outer frame in a sliding mode and is parallel to the back side plate, the side fastening plates are arranged on the left side and the right side in the outer frame and elastically connected with the left side plate or the right side plate through springs, one end of each pull strip is fixedly connected to the side fastening plates, the other end of each pull strip is a free end and stretches out of the outer frame, and the supporting rod and the lower bottom plate are hinged. A sensor fastening component for containing a fixing sensor is defined by the lower bottom plate, the upper pressing plate, the side fastening plates and the front side plate. Compared with the prior art, the multifunctional fast GIS partial discharge measuring sensor fixing device has the advantages of being safe and convenient to use, fast to mount and dismount, efficient and the like.