An array substrate and a fabricating method thereof and a display apparatus are provided. The array substrate comprises a base substrate, a pixel electrode layer formed on the base substrate, and a first wire grid polarizing film disposed on a surface of the pixel electrode layer, wherein the first wire grid polarizing film includes a plurality of first metal lines (L1) which are mutually parallel and are periodically arranged; the surface of the pixel electrode layer is a surface of the pixel electrode layer facing the base substrate or a surface of the pixel electrode layer opposite to the base substrate. The array substrate and the fabricating method thereof and the display apparatus can facilitate an ultrathin design.