An array substrate and a manufacturing method thereof, a display panel, and a display device are provided. The array substrate includes a base substrate, gate lines and data lines, switch circuits, a common electrode layer, and a light shielding conductive layer. The gate lines and the data lines are on the base substrate and cross with each other to define pixel regions; the switch circuits are in the pixel regions; the common electrode layer is on a side of the switch circuits away from the base substrate; and the light shielding conductive layer is on the side of the switch circuits away from the base substrate and is electrically connected to the common electrode layer. At least a portion of an orthographic projection of the gate lines, the data lines and the switch circuits is within an orthographic projection of the light shielding conductive layer on the base substrate.