A display panel and a manufacturing method thereof are provided. The display panel includes a substrate, a thin film transistor (TFT) device layer, a luminescent device layer, and a thin film encapsulation layer, wherein the thin film encapsulation layer includes a first inorganic layer, a first hardening layer disposed on the first inorganic layer, a second inorganic layer disposed on the first hardening layer, an organic planarization layer disposed on the second inorganic layer, a second hardening layer disposed on the organic planarization layer, a third inorganic layer disposed on the second hardening layer, and a third hardening layer disposed on the third inorganic layer, thereby realizing a cover window and encapsulation structure characteristics at the same time, and achieving ultra-thin encapsulation.