A backlight assembly and a display device are provided in the present disclosure. The backlight assembly includes an optical lamination layer and a die-casting back plate. The die-casting back plate defines an accommodation space for accommodating the optical lamination layer, the die-casting back plate includes an inner surface and an outer surface arranged opposite to each other, the inner surface is a surface facing a bottom surface of the optical lamination layer, a recess region is arranged on the inner surface, and a plurality of rivets configured to assemble the die-casting back plate onto an object to be assembled is arranged on the outer surface. The plurality of rivets is located in a region corresponding to the recess region and spaced apart from a boundary of the recess region by a spacing.