The present invention discloses an array substrate, a manufacturing method thereof, and a display device. The array substrate includes a display area, a common potential bus located at the periphery of the display area, and a plurality of gate lines; a portion of the common potential bus, which is located at the periphery of the first side of the display area, is the first area of the common potential bus; a portion of the common potential bus, which is located at the periphery of the second side of the display area, is the second area of the common potential bus; each of the plurality of gate lines is used for driving a row of sub-pixels; a direction from the first side to the second side of the display area is the same as the extension of the gate lines; and in a direction perpendicular to the direction of the array substrate, at least one of the gate lines is only overlapped with the first area of the common potential bus in an insulated manner, and/or at least one of the gate lines is overlapped with the second area of the common potential bus in an insulated manner. With the array substrate provided by the embodiments of the present invention adopted, the power consumption of the display device can be decreased with high resolution ensured.