An array substrate and manufacturing method thereof, a display device are provided. The array substrate includes a display region and a non-display region; the non-display region includes a first laminated structure and a second laminated structure that are separately disposed on a base substrate, a gap between the first laminated structure and the second laminated structure constitutes a connecting hole; the first laminated structure includes a first via hole provided for exposing a first metal layer, the second laminated structure includes a second via hole provided for exposing a second metal layer, the first via hole and the second via hole are connected to a connecting hole via breaches on corresponding walls, and the first metal layer and the second metal are electrically connected with a conductive film.