The embodiment of the invention provides an LED lamp bar, a backlight source module and a display device, and relates to the technical field of display, and the LED lamp bar can improve a Hot Spot phenomenon in the prior art. The LED lamp bar comprises a circuit board and a plurality of LEDs arranged on the circuit board, and further comprises a membrane set which is fixedly connected to the circuit board and covers the LEDs, wherein the module set is used for converting light emitted by the LEDs into a uniform surface light source.