A display screen assembly and a display device are disclosed. The display screen assembly includes a cover and a flexible display panel disposed in a stack arrangement. The cover is configured with peripheral edges bending toward the flexible display panel. The flexible display panel includes a first plane, a curved surface disposed around the first plane, and a second plane adjoining the curved surface. The curved surface includes a first curved surface and a second curved surface. The first curved surface bends and extends from peripheral edges of the first plane in a direction where the peripheral edges of the cover bend, and the second curved surface bends and extends from peripheral edges of the first curved surface with a predetermined radius in a direction toward the first plane.