An embodiment of the invention provides a backlight module and a display device, relates to the technical field of display, and solves the problem that membrane material cannot be positioned due to a narrow frame when fixed on the direction perpendicular to the membrane material. The backlight module comprises a backboard, the membrane material and at least one membrane material fixing structure. The membrane material is arranged on the backboard and comprises a bent part. The membrane material fixing structures are arranged on at least one side faces of the backboard, and the bent part of the membrane material is fixed on the backboard through the membrane material fixing structures.