The utility model discloses an energy -saving power transformer's cooling body, include the box and be located box internal iron core, box week is inclined and is equipped with the heating panel through the elastic mechanism, box week is inclined and is equipped with the annulus, the annulus has water conservancy diversion spare, water conservancy diversion spare has the pipe that communicates with it. Ground under the box is equipped with the hole in the ground, the pipe is located the hole in the ground. This transformer need not to install radiator fan, and it is effectual to cool down, operation safe and reliable.