A backlight module and a display device are disclosed. The backlight module includes a light guide plate and a position limit structure. The position limit structure includes a support plate and an elastic position limit protrusion disposed on the support plate, the elastic position limit protrusion corresponds to a side surface of the light guide plate, and the elastic position limit protrusion generates elastic deformation along a direction perpendicular to the support plate upon being pressed by the side surface of the light guide plate.