The invention provides an organic light emitting display panel and a manufacturing method thereof, and a display device. In the organic light emitting display panel and the manufacturing method thereof, and the display device of the invention, since a quantum material layer exhibiting quantum size effects is arranged on a side of a color filter substrate close to an array substrate or on a side of an array substrate close to a color filter substrate, and can convert a part of light emitted thereinto from the organic light emitting unit into light with a same color as that of a corresponding sub-pixel, the utilization rate of light emitted from the organic light emitting unit is increased, brightness is improved, and power consumption is reduced.