Provided are an array substrate and a manufacturing method thereof, and a display device. The array substrate includes a plurality of data lines and sub-pixels. At least one sub-pixel includes: a first insulating layer; a gate; an active layer located on one side of the first insulating layer away from the gate; a pixel electrode; a first electrode located connected to the active layer and in contact with the pixel electrode; a second electrode connected to the active layer and a data line; a second insulating layer having a first opening, wherein the orthographic projection of the first opening partially overlaps with the orthographic projections of the pixel electrode and the first electrode; a connection electrode in contact with the pixel electrode and the first electrode through the first opening; and a common electrode located on one side of the second insulating layer away from the pixel electrode.