The invention discloses an organic electroluminescent display panel, a manufacturing method thereof and a display device. The manufacturing method comprises a process of manufacturing a pixel array and a process of manufacturing an encapsulation layer. A light emitting layer and a pixel defining layer of the pixel array enclose a recessed area. The process of manufacturing the encapsulation layercomprises: printing a planarization layer formed by a first ink on the recessed area; and printing an organic film layer formed by a second ink over the planarization layer. Thus, the organic film layer is formed on the basis of the planarization layer, the leveling difficulty of the organic material of the organic film layer can be reduced, thereby reducing the leveling time, making the thicknessof the organic film layer easy to control, obtaining a thinner organic film layer, achieving the effects of reducing the thickness of the planarization layer and the overall thickness of the organicfilm layer, and improving the encapsulation performance.