A folding display device is provided in an embodiment of the present application. The folding display device includes a housing, a folding mechanism, a flexible display panel, and a linkage slider. The housing includes a first housing and a second housing. The folding mechanism is accommodated in the housing and rotatably connected to the first housing and the second housing. The flexible display panel is provided on one side of the first housing, the second housing, and the folding mechanism. The linkage slider is provided between the first housing or the second housing and the folding portion, and is slidably connected along a longitudinal symmetry axis of a folding portion.