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S13 type high overload power distribution transformer is one kind of distribution product which can overload run under certain condition. In rural areas, the average load rate is low; however, during Spring Festival and busy period, the load will increase in short time and the transformer will be overloaded easily. On the basis of normal temperature rise, high overload power distribution transformer can operate 6h under 1.5 times of rated capacity (in which load up for 3h and load down for 3h), operate 3h under 1.75 times of rated capacity (in which load up for 1.5h and load down for 1.5h) and operate 1h under 2.0 times of rated capacity and above overload operation cannot affect the normal life time of transformer. This product can not only guarantee the demand of long-term small load operation but also meet the short-time overload requirement. The cross section of iron core is multistage and D type yoke. And laser grooving cold-rolled grain oriented silicon steel sheet is adopted and the product is featured with low no-load loss and small noise etc.