Oil tank for oiling oil filling casing

The utility model discloses an oil tank for oiling an oil filling casing, including an oil chamber. The oil chamber is provided with an oil filling aperture; a pressure chamber is provided in the oil chamber; the oil outlet on the pressure chamber is connected with a temporary storage chamber; and the oil pipe at the outlet of the temporary storage chamber is provided with an inverted valve. In the utility model, the oil chamber is used for storing transformer oil, and the top end of the oil chamber is provided with an oil filling aperture, which can be used by an oil supplement apparatus to add oil. When oil supplement is carried out, a piston is lifted and compressed repeatedly by a pressure rod, the transformer oil in the oil chamber can be extracted and sent to the temporary storage chamber, and then sent to an oiling apparatus through the inverted valve at the outer end of the temporary storage chamber. During the oiling process, the oiling nozzle of the oiling apparatus is directly inserted into the oil