The utility model provides a transformer on -load tap -changer grease chamber finder which characterized in that is equipped with hollow control rod, inspection head, oil drain pump, image processing monitor, and the control rod front end is connected with the inspection head mutually, and the control rod rear end is equipped with operating handle, and the terminal surface is equipped with the oil absorption mouth under before the inspection head, and the oil absorption mouth is connected with the oil drain pump oil inlet through leading oil pipe mutually, and the overhead sponge oil absorption piece that is equipped with of inspection behind the oil absorption mouth is checked to be equipped with six super wide angles glass camera lenses and bulb entirely on the first front end face, the utility model discloses the when used, the indoor oil that produces oil of laying aside for the moment will be checked the head and stretch the oil feed room, open oil drain pump, the excess oil by the oil absorption mouth, lead the oil pipe suction, sponge oil absorption piece carries out further cleanness, magnetic force is inhaled the piece and is handed over metal powder or the metal of screw class in the grease chamber to adsorb, has checked ne -leakage or damage to the grease chamber by six full glass camera lenses of super wide angle, the bulb is used for the place that needs threw light on, the utility model has the advantages of easy operation, convenient to use, inspection are effectual.