The present application provides a foldable array substrate, a preparation method thereof and a display device. The foldable array substrate includes a base substrate, a gate metal layer disposed on one side of the base substrate, a source-drain metal layer disposed on the side of the gate metal layer opposite to the base substrate, and an insulating layer disposed between the gate metal layer and the source-drain metal layer. A plurality of holes are disposed on the foldable array substrate, and the holes are disposed between adjacent pixel units of a plurality of pixel units, and extend from the side of the insulating layer opposite to the base substrate toward the base substrate.