The invention provides a manufacturing method for flexible display panel, comprising providing an array substrate, the array substrate comprising a semiconductor layer, dividing the flexible display panel into a pixel area and a bending area, adjacent to each other, the pixel area comprising the semiconductor layer; disposing a second groove in the bending area, and the second groove forming a step structure in the array substrate, the step structure extending from inside of the array substrate towards direction opposite to inner wall of the second groove; filling the second groove with an organic material, and the organic material filling the second groove forming a concave tapered groove with flat surface of the array substrate; fabricating a source, a drain, and source/drain wiring on the array substrate, the source and the drain being connected to the semiconductor layer, the source/drain wiring covering the tapered groove.