An array substrate and a manufacturing method thereof are provided. The array substrate includes a display area (02) and a fan-out area (01) disposed at the periphery of the display area (02), the manufacturing method comprising forming a line pattern (212) disposed in at least one of the display area (02) and the fan-out area (01), wherein forming a line pattern disposed in at least one of the display area and the fan-out area includes the following steps: forming a metal layer (210); forming an intermediate pattern (211) by performing a first patterning process on the metal layer; and forming the line pattern disposed in at least one of the display area (02) and the fan-out area (01) by performing a second patterning process on the intermediate pattern. The manufacturing methods provided by the respective embodiment of the present disclosure are capable of narrowing of the lines in the fan-out area, and compared with the existing one exposure method, can effectively reduce the risk of open-circuit and short-circuit.