Oil-immersed transformer

The utility model discloses an oil-immersed transformer which comprises an oil tank, square shed oil is contained in the oil tank, a sealing cover is arranged at the upper end of the oil tank, an iron core is arranged in the oil tank, a layer of low-voltage winding wraps the outer portion of an iron core column structure of the iron core, a layer of high-voltage winding wraps the outer portion of the low-voltage winding, and the high-voltage winding wraps the outer portion of the iron core column structure of the iron core. Iron core column structures of the iron core are fixedly connected through an iron yoke structure, a first floating rod is arranged at the side end of the oil tank and fixedly connected with an oil conveying sealing plug through a connecting rod, and a second floating rod is arranged in the middle of the connecting rod of the first floating rod. By arranging the structure of the floating rod and the oil conveying sealing plug, the height of the floating rod and the oil conveying sealing pl