An array substrate and a manufacturing method thereof are disclosed. The present disclosure relates to the technical field of display, whereby the qualified rate of the array substrate can be improved, and the manufacturing cost thereof can be reduced significantly. The array substrate comprises a first wiring, a first insulating layer, and a second wiring from bottom up in sequence, wherein said second wiring crosses over said first wiring; wherein a crossed-over part of said second wiring consists of a plurality of branches, with an interspace formed between every two adjacent branches, so as to obtain a comb structure; and wherein at least one of the branches is nearer to said first wiring relative to other branches. The array substrate of the present disclosure can be used in liquid crystal TV, liquid crystal display, mobile phone, tablet personal computer, and other display devices.