The utility model discloses a device for overhead line's inspection, including insulating holding rod, the upper and lower both ends of this insulation holding rod are provided with double-screw bolt and the screw that the size corresponds respectively, and the joint number of insulating holding rod highly increases and decreases according to actual inspection, there is insulating telescopic link insulating holding rod upper end through threaded connection, and the detecting head is installed to the upper end of this insulation telescopic link, and this detecting head is connected with control through the long lead and display device connects the utility model discloses overhead line inspection device has good insulating effect to can adjust according to the detection height and the scope of reality, overhead line needn't be pressed close to simultaneously to quickly determine fault point and through the image recording when being convenient for that equipment breaks down on overhead line and post, has high security