The disclosure provides a display panel, a manufacturing method thereof, and a display device. A display area is defined on a surface of the display panel, and a first electricity supply area and a second electricity supply area are disposed opposite to each other at two sides of the display area. The display panel includes a substrate layer, and a first metal layer and a second metal layer which are sequentially disposed on the substrate layer, and an insulating layer is further disposed between the first metal layer and the second metal layer in the display area.