A light-emitting diode (LED) display panel, a manufacturing method thereof and a display device are disclosed. The LED display panel comprises a thin-film transistor (TFT) backplane, a light-emitting structure and an overcoat (OC) layer (10). The OC layer (10) is disposed between the TFT backplane and the light-emitting structure and configured to cover gate lines (21) and data lines (22) in a display area of the LED display panel. The manufacturing process of the LED display panel adds the process of the OC layer (10) and hence can effectively avoid the scratches onto the TFT backplane caused by an evaporation mask plate when the light-emitting structure is formed and prevent the caused electrostatic problem.