A flexible display device comprising: a display screen, a side of the display screen for image display being a display side, a side opposite to the display side being a back side; a plurality of limiting structures arranged at the back side of the display screen, whereby each limiting structure comprises a bottom end, a head end and a tail end; an end surface of the bottom end is fixed on the back side of the display screen; characterized in that: 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 (α1) between the first abutting surface and the second abutting surface faces 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 (α2) between the third abutting surface and the fourth abutting surface faces away from the display screen, and the angle between the third abutting surface and the fourth abutting surface is larger than the angle between the first abutting surface and the second abutting surface; the plurality of limiting structures are arranged in at least one row, a protrusion of a latter limiting structure in one row is located in a groove of a previous limiting structure, and the first abutting surface of the latter limiting structure is opposite to the third abutting surface of the previous limiting structure, the second abutting surface of the latter limiting structure is opposite to the fourth abutting surface of the previous limiting structure; when the flexible display device bends towards the back side to a first curvature, the first abutting surface of the latter limiting structure and the third abutting surface of the previous limiting structure abut against each other; when the flexible display device bends towards the display side to a second curvature, the second abutting surface of the latter limiting structure and the fourth abutting surface of the previous limiting structure abut against each other. 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 (α1) between the first abutting surface and the second abutting surface faces 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 (α2) between the third abutting surface and the fourth abutting surface faces away from the display screen, and the angle between the third abutting surface and the fourth abutting surface is larger than the angle between the first abutting surface and the second abutting surface; the plurality of limiting structures are arranged in at least one row, a protrusion of a latter limiting structure in one row is located in a groove of a previous limiting structure, and the first abutting surface of the latter limiting structure is opposite to the third abutting surface of the previous limiting structure, the second abutting surface of the latter limiting structure is opposite to the fourth abutting surface of the previous limiting structure; when the flexible display device bends towards the back side to a first curvature, the first abutting surface of the latter limiting structure and the third abutting surface of the previous limiting structure abut against each other; when the flexible display device bends towards the display side to a second curvature, the second abutting surface of the latter limiting structure and the fourth abutting surface of the previous limiting structure abut against each other.