a transformer structure having double - axis iron core is disclosed . the iron core structure mainly includes an iron core main body that has a base . the base has a parallel salient side convex part furnished respectively at the two opposite side edge thereof , and has a chamfered part furnished respectively at the two end parts corresponding to the side convex part thereof . it utilizes two iron core main bodies to be oppositely combined . in association with different shapes of coil , it is capable of forming various transformer structures and possesses a variety of combination , and is capable of adapting to various requirements of the product .