A method for fabricating an organic light-emitting display panel, the method comprising: providing (S101) a substrate with a plurality of sub-pixels arranged in an array, wherein areas of opening regions of sub-pixels in different colors are not exactly the same; and forming (S102) light-emitting layers sequentially in the opening regions of the sub-pixels in the different colors; wherein at least one of the sub-pixels other than a sub-pixel with a largest area is a first sub-pixel, and sub-pixels other than the first sub-pixel are second sub-pixels; wherein forming the light-emitting layers sequentially in the opening regions of the sub-pixels of different colors comprises: jetting (S201) a solvent for dissolving a light-emitting material in at least one of the second sub-pixels in which no light-emitting layer is formed; after the solvent in the at least one of the second sub-pixels is jetted, jetting (S202) ink comprising the solvent and a light-emitting material corresponding to the first sub-pixel in the first sub-pixel; after the ink comprising the solvent and the light-emitting material corresponding to the first sub-pixel is jetted in the first sub-pixel, drying the substrate in which the ink in the first sub-pixel is jetted, to form a film; and after the film in the first sub-pixel is formed, jetting ink comprising a solvent corresponding to the second sub-pixel and a light-emitting material corresponding to the second sub-pixel in the second sub-pixel. providing (S101) a substrate with a plurality of sub-pixels arranged in an array, wherein areas of opening regions of sub-pixels in different colors are not exactly the same; and forming (S102) light-emitting layers sequentially in the opening regions of the sub-pixels in the different colors; wherein at least one of the sub-pixels other than a sub-pixel with a largest area is a first sub-pixel, and sub-pixels other than the first sub-pixel are second sub-pixels; wherein forming the light-emitting layers sequentially in the opening regions of the sub-pixels of different colors comprises: jetting (S201) a solvent for dissolving a light-emitting material in at least one of the second sub-pixels in which no light-emitting layer is formed; after the solvent in the at least one of the second sub-pixels is jetted, jetting (S202) ink comprising the solvent and a light-emitting material corresponding to the first sub-pixel in the first sub-pixel; after the ink comprising the solvent and the light-emitting material corresponding to the first sub-pixel is jetted in the first sub-pixel, drying the substrate in which the ink in the first sub-pixel is jetted, to form a film; and after the film in the first sub-pixel is formed, jetting ink comprising a solvent corresponding to the second sub-pixel and a light-emitting material corresponding to the second sub-pixel in the second sub-pixel. jetting (S201) a solvent for dissolving a light-emitting material in at least one of the second sub-pixels in which no light-emitting layer is formed; after the solvent in the at least one of the second sub-pixels is jetted, jetting (S202) ink comprising the solvent and a light-emitting material corresponding to the first sub-pixel in the first sub-pixel; after the ink comprising the solvent and the light-emitting material corresponding to the first sub-pixel is jetted in the first sub-pixel, drying the substrate in which the ink in the first sub-pixel is jetted, to form a film; and after the film in the first sub-pixel is formed, jetting ink comprising a solvent corresponding to the second sub-pixel and a light-emitting material corresponding to the second sub-pixel in the second sub-pixel. <EOS>