This invention provides a display panel and a fabricating method thereof. Wherein the display panel defines a display area and an edge area. The display panel includes a substrate, a gate layer, a gate insulating layer, a thin film encapsulation layer, and a polyimide layer. By disposing a buffer tank on the gate insulating layer, the flow rate of the polyimide solution printed through inkjet printing in the edge region is reduced when the polyimide layer is forming, thereby causing it to solidify to form the polyimide layer before flowing over a retaining wall, and preventing sealant contamination and peeling.