The present disclosure can provide a foldable display panel, a manufacture method thereof and a foldable display device. The foldable display panel includes a display module, where the display module includes a first foldable part, and first flat parts located on two sides of the first foldable part; and an ultrathin glass cover window which is located on the side of a light emitting surface of the display module, where the ultrathin glass cover window includes a second foldable part, and second flat parts located on two sides of the second foldable part; and an orthographic projection of the second foldable part on the display module covers the first foldable part, and orthographic projections of the second flat parts on the display module cover the first flat parts.