The invention relates to the technical field of display and discloses a flexible display device. The flexible display device comprises a flexible display screen, a rolling wheel, a driving system and a rolling wheel control structure, wherein the rolling wheel is arranged on the rolling wheel control structure; the driving system controls the rolling wheel to reciprocate along the arranging direction of the flexible display screen; the rolling wheel is of a spiral ring structure; one end of the flexible display screen is positioned at any opening in the spiral ring structure; and when the rolling wheel reciprocates along the arranging direction of the flexible display screen, the flexible display screen comes in or out of the spiral ring structure in the rolling wheel. The rolling wheel is of the spiral ring structure, and the flexible display screen and the rolling wheel are not connected, so that the damage to the display screen can be reduced, the flexible display screen comes in or out of the spiral ring along with the movement of the rolling wheel, flexible display of the display screen is realized, and when the flexible display screen comes in the spiral ring, tests on the curvature and the reliability of the flexible display screen can be performed.