A backlight module and a display device are provided in the present disclosure. The backlight module includes: a light guide plate, a plastic frame and a back plate; the back plate includes an accommodating portion and a folded edge perpendicular to the accommodating portion; the light guide plate is disposed on the accommodating portion; the plastic frame is configured to be in a snap engagement with the folded edge of the back plate and includes an outer blocking wall and a carrying portion perpendicular to the outer blocking wall; and a blocking member is disposed between the folded edge and the light guide plate, and the blocking member is configured to block light leakage at a position where the outer blocking wall and the folded edge are snap engaged.