The invention discloses an array substrate and a manufacturing method thereof, and a display apparatus. A metal shielding layer is electrically connected with a common electrode, a first connection portion for electrically connecting the metal shielding layer with the common electrode and a source drain electrode are arranged in the same layer, and the first connection portion is electrically connected with the metal shielding layer through a through hole penetrating a first insulation layer and a buffer layer, such that the array substrate provided by the embodiments of the invention can form storage capacitance between an active layer and the metal shielding layer, the purpose of increasing the capacitance of the array substrate is achieved, and during preparation, the first connection portion and the source drain electrode which are arranged in the same layer are formed through a primary patterning process, thus the manufacturing process can be reduced, the manufacturing technology is simplified, and the purposes of saving manufacturing cost and shortening manufacturing time can be finally realized.