The invention discloses a flexible display device. The flexible display device comprises a flexible display screen and a folding mechanism. The folding mechanism comprises at least two supporting pieces and at least one connecting piece, each supporting piece is movably connected with the corresponding connecting piece, and each supporting piece can rotate and conduct translational movement relative to the corresponding connecting piece, so that when the two supporting faces of each two adjacent supporting pieces are in a folded state; each two supporting pieces can move on the contrary to enlarge the gap between each two supporting faces, therefore the bending radius of a bending part is increased, and the time that a crack and a bending mark are generated on the bending part after the bending part is bent for a long time is delayed; and further the service life of the bending part is prolonged, and the using stability of the flexible display screen is improved.