The present application provides a method and semiconductor packaging structure comprising a conductive substrate having a first surface, a first lateral surface and a second lateral surface adjacent to the first surface. A first electrode line with two ends are provided on the first surface and the first lateral surface, and a second electrode line with two ends are provided on the first surface and a second lateral surface respectively. A semiconductor device is provided on the first surface of the conductive substrate which electrically connected to the first electrode line and the second electrode line, a protective plate with through holes covers the first surface, and a sheathing overlays the semiconductor device.