The invention provides a manufacturing method of a flexible display panel. The manufacturing method comprises the following steps of providing an array substrate, wherein the array substrate comprisesa semiconductor layer, the flexible display panel is divided into adjacent pixel region and bending region, and the pixel region comprises the semiconductor layer; digging a second groove in the bending region, wherein the second groove forms a stage structure in the array substrate, and the stage structure extends from the interior of the array substrate to a direction opposite to the inner wallof the second groove; filling the second groove with an organic material, and an inwardly concave conical groove is formed in the surface, flush with the array substrate, of the organic material filled in the second groove; and manufacturing a source, a drain and source and drain routing lines on the array substrate, wherein the source and the drain are connected to the semiconductor layer, and the source and drain routing lines cover the conical groove. By virtue of the above-mentioned setting, the bending degree of the source and drain routing lines in the position of the conical groove canbe lowered, thereby effectively relieving the problem of cracking of the source and drain routing lines in the position of the conical groove. The invention also provides the flexible display panel.