A foldable display device is provided, including a middle frame, a flexible display panel positioned on the middle frame, and a support assembly. The middle frame includes a folding part and non-folding parts positioned at two opposite sides of the folding part. The support assembly is disposed on the back of the middle frame, and buffer strips are disposed around the middle frame. The support assembly includes support frames that are rotatable relative to the non-folding parts, which can not only prevent holding the display panel by hand or using an external bracket for supporting the display panel, but also prevent damages to the flexible display panel when it is dropped.