The present application provides a foldable display device. The foldable display device includes a display panel and a rotation mechanism supporting the display panel. The rotation mechanism includes a first sliding member and a second sliding member. The first sliding member and the second sliding member are slidably connected to the first base. Relative sliding of the first sliding member and the second sliding member drives opposite sides of the rotation mechanism to be folded synchronously to improve fluency and stability in a folding process.