The present invention provides a flexible display device. A plurality of limiting structures are arranged at the back side of a display screen in rows with an end surface of a bottom end of each limiting structure fixed on the back side of the display screen. The head end has a protrusion, the protrusion comprising a first abutting surface and a second abutting surface adjoined with each other, an opening of an angle between the two surfaces away from the display screen. The tail end has a groove, the groove comprising a third abutting surface and a fourth abutting surface adjoined with each other, an opening of an angle between the two surfaces away from the display screen and the angle being larger than the angle between the first abutting surface and the second abutting surface.