The invention provides an array substrate. The array substrate comprises a test pad located in a test pad area and a routing line located in a routing area, wherein the routing line is connected with the test pad; the routing line comprises a first metal layer, a first insulation layer, a first passivation layer, a second insulation layer, a second passivation layer and a transparent electrode layer which are successively arranged on the substrate and are located in the routing area. The invention also provides a manufacturing method of the routing line and the test pad of the array substrate as well as a liquid crystal panel. In a routing structure of the array substrate, a second metal layer which is a source-drain metal layer of a thin film transistor is eliminated; a pixel electrode layer is in span connection with the first metal layer; a plurality of film layers are arranged between the pixel electrode layer and the first metal layer, and a long distance is formed between the pixel electrode layer and the first metal layer, thus the breakdown threshold voltage can be increased, and the stray capacitance can be reduced, so that the occurrence probability of electrostatic discharge can be reduced.