The utility model provides a spiral transformer device structure on piece, the device forms by a plurality of device cell cube is parallelly connected, its characterized in that: the device cell cube includes the substrate, the insulating oxide, the first metal layer, silicon dioxide layer, first line hole, the second metal level, polyimide, third metal layer and second line hole, the second metal level has threely, the second metal level on intermediate sum right side is connected with the first metal layer through first line hole, third metal layer has threely, the third metal layer on left side and right side is passed through second line hole and is connected with the second metal level on left side and right side respectively, be used for drawing forth secondary coil, middle third metal layer is used for drawing primary. The utility model provides a spiral transformer on the octagon piece, is al used to the novel and superior performance of device structure si cu not only can be compatible with conventional CMOS production line as metal coil, and the precision of metal live width control is higher, has reduced the degree of difficulty of manufacture craft, has reduced the cost of manufacture simultaneously.