An array substrate and a fabrication method thereof, and a display device are provided. The array substrate comprises a gate line and a data line intersecting with each other. The data line and the gate line are formed in a same layer on a substrate, the data line is disconnected in a region of the gate line. A connection pattern is formed in the region of the gate line, the connection pattern is insulated from the gate line, and ends of the data line located on both sides of the gate line are electrically connected by the connection pattern.