Abstract: A network transformer includes: a first magnetic ring; a first cable winded on the first magnetic ring, wherein the first cable comprises a first wire, a second wire, a third wire and a fourth wire; a second magnetic ring; and a second cable winded on the second magnetic ring, wherein the second cable comprises a fifth wire and a sixth wire; wherein a first end of the first wire is connected to a first end of the fifth wire, and a second end of the first wire is connected to a first end of the sixth wire. A producing method of the network transformer is also provided. With the above structure and producing method, automatic devices are applicable for producing the network transformer, which simplifies operation, improves production efficiency, and lowers labor costs.