The invention relates to the technical field of display, and discloses an array substrate, a maintenance method of the array substrate, a display panel and a display device. The aim is to improve the maintenance success rate of the array substrate. The array substrate comprises a substrate, a common electrode layer, a first metal layer, a first insulation layer and a second metal layer, wherein the common electrode layer, the first metal layer, the first insulation layer and the second metal layer are arranged on the substrate in sequence; the first metal layer comprises a set of grating lines extending in the first direction and a common electrode lead net connected with the common electrode layer; the second metal layer comprises a set of data lines extending in the second direction and a plurality of maintenance connecting parts corresponding to the grating lines one by one, the maintenance connecting parts comprise first overlapping parts relative to the positions of the corresponding grating lines and second overlapping parts relative to the position of the common electrode lead net.