High-overload transformer

The invention relates to a high-overload transformer. In order to solve the problems of high material consumption, poor heat dissipation effect and the like of a high-overload transformer which is frequently used in domestic, the high-overload transformer which is low in loss and good in heat dissipation is provided. The high-overload transformer comprises an iron core, a high-voltage winding, a low-voltage winding and an oil tank, wherein a low-voltage coil is wound around one side of the iron core, a high-voltage winding is wound around the other side of the iron core, the iron core, the low-voltage coil and the high-voltage coil are arranged in the oil box, the iron core is of an oval structure formed by laminating high-magnetic conduction silicon steel or amorphous alloy, the magnetic flux density of the iron core is smaller than 1.68T, the low-voltage winding employs a paper covered rectangular wire, the current density of the low-voltage winding is smaller than 3.5A/mm , the high-voltage winding is of a