The present disclosure provides a display panel, a manufacturing method of a display panel, and a display device including the display panel. The display panel includes: an array substrate, including a display region, a non-display region around the display region, and data lines extending into the non-display region; a planarization layer, covering the data lines; and a metal wiring layer, disposed on the planarization layer in the non-display region, and including a plurality of metal wirings spaced apart from each other and corresponding to the data lines.