The utility model provides a device for fixing a measuring probe onto a corona cage. The device is a cuboid-shaped fixation element which is arranged vertically. The upper end and the lower end of the fixation element are provided with bending elements symmetrically on a same side. The middle portion of the other side surface of the fixation element is provided with a boss and a horizontal connecting rod running through the center of the fixation element. According to the utility model, the advantage of simple structure can be realized, and the free extension, retraction, rotation and fixation of the electric transmission line audible noise measuring probe in the corona cage in the extra-high voltage environment can be realized without influencing the corona discharge and corona noise propagation.