Oil-immersed transformer for power frequency test

The utility model relates to the technical field of transformers, and provides an oil-immersed transformer for a power frequency test, which is convenient to seal during use and convenient to observe oil in the transformer after being used for a long time, and comprises a box body, the top end of the box body is provided with an oil filling port, and the oil filling port is fixedly connected with a filter cartridge; a fixed ring is fixedly connected to an oil injection opening in the top end of the box body, a rotating ring is rotationally connected to the fixed ring, a plurality of fixed rods are fixedly connected to the top end of the fixed ring, sealing plates are rotationally connected to the multiple fixed rods, sliding rods are fixedly connected to the bottom ends of the multiple sealing plates, and a plurality of sliding grooves are formed in the rotating ring; a first electric cylinder is installed at the top end of the box body, the output end of the first electric cylinder is fixedly connected with