The utility model relates to an oil tank of an intermediate-frequency reactor, which comprises an oil tank body, wherein an iron core and transformer oil are arranged in the oil tank, the iron core is connected with a reactor transmission mechanism, and aluminum plate shielding layers are installed around the inner wall of the oil tank. The aluminum plate shielding layers are additionally installed around the inner wall of the oil tank, and a magnetic shielding net is formed around the iron core, so that various potential safety hazards can be effectively avoided, for example, the inner wall of the oil tank is locally overheated or punctured, the normal work of the reactor is ensured, and the service life of the oil tank is prolonged.