Switchable stereoscopic display device

The invention discloses a switchable three-dimensional display device, which comprises a display module, a lens array layer and a liquid crystal lens, wherein the lens array layer is overlapped above a display surface of the display module; the display surface of the display module emits an image light, and the liquid crystal lens and the lens array layer are both located on a transmission path of the image light. A first distance is arranged between the surface of the liquid crystal lens and the light incident surface of the lens array layer, and a second distance is arranged between the surface of the liquid crystal lens and the display surface. When the switchable three-dimensional display device performs two-dimensional image display, the liquid crystal lens is in a lens mode, and the focal length range of the lens mode is between the first interval and the second interval, so that the image light is diffused. When the switchable three-dimensional display device performs three-dimensional image display, t