The invention discloses a display panel, a manufacturing method thereof and a display device, and belongs to the technical field of display. The method comprises the steps: forming a binding pattern comprising at least one conducting layer on a substrate, wherein the surface, away from the substrate, of each conducting layer has a binding area; forming a flat layer on the substrate on which the binding pattern is formed, and processing the flat layer into a flat layer pattern, wherein the flat layer pattern comprises an opening area and a shielding area, the orthographic projection of the binding area on the substrate being located in the orthographic projection of the opening area on the substrate, and the orthographic projection of the side surface of the conducting layer on the substrate being located in the orthographic projection of the shielding area on the substrate. In this way, the shielding area can cover the area, where an interlayer is possibly exposed, of the side surfaceof the conducting layer, so that replacement reaction between anode etching liquid and metal material of the interlayer is avoided, the risk of short circuit caused by the fact that replaced metal isattached to the binding pattern is also avoided, and the abnormal display phenomenon of the display panel is also avoided.