An OLED display panel, a method for manufacturing the same and an OLED display device are disclosed. The OLED display panel comprises a flat region and a curved region, wherein the OLED display panel comprises a light-emitting element in the flat region and a light-emitting element in the curved region, each light-emitting element comprises a cathode and an anode, and a distance between the anode and the cathode of the light-emitting element in the curved region is greater than a distance between the anode and the cathode of the light-emitting element in the flat region.