A foldable electronic device is disclosed and includes a first body, a second body, a hinge mechanism, and a cover. The hinge mechanism includes a first rack plate disposed to the first body, a second rack plate disposed to the second body, a first gear shaft meshed with the first rack plate, and a second gear shaft meshed with the second rack plate and the first gear shaft. The cover is movably disposed on the hinge mechanism and covers the hinge mechanism. When the second body rotates relative to the first body, the second rack plate, the second gear shaft, the first gear shaft and the first rack plate rotate in sequence, the first rack plate and the second rack plate abut against the cover, so the cover is away from the hinge mechanism and separated from the first body and the second body.