The invention relates to the technical field of display, in particular to a display device, an array substrate and a manufacturing method thereof. The display device comprises a substrate, a source-leakage electrode layer located on the substrate and made of a low-resistance material, and an anti-static unit surrounding the periphery of the substrate and made of heavily-doped low-temperature polycrystalline silicon, wherein the anti-static unit is grounded. According to the display device, the array substrate and the manufacturing method, the anti-static unit made of the heavily-doped low-temperature polycrystalline silicon is arranged on the periphery of the substrate in a surrounding mode, the heavily-doped low-temperature polycrystalline silicon has certain resistance performance and conductive performance, the effects of attracting current, consuming current and guiding current can be played, the circuit safety of the array substrate is guaranteed to the most extent, and the quality of a final product is improved.