The utility model provides a prevent oil immersible power transformer that reveals relates to the transformer field. This prevent oil immersible power transformer that reveals, including the box, the inner wall bottom fixedly connected with oil tank of box, the inner wall bottom of box just is located the both sides fixedly connected with fixed block of oil tank, the top fixedly connected with motor of fixed block, the output fixedly connected with rotation axis of motor, the end screw thread connection that the motor was kept away from to the rotation axis has the bearing frame, the top fixedly connected with fixed plate of bearing frame, the inner wall fixed connection of fixed plate one end and box. Should prevent the oil immersible power transformer of leakage, through the inside motor that sets up of box, the rotation of taking driven rotating shaft under the effect of motor can drive moving down of lagging under the rotation of rotation axis, because lagging and fuel tank cap fixed connection, so compress tightly the oil leak that prevents the oil tank to the fuel tank cap in motor rotation meeting.