The invention discloses a three-dimensional display device and belongs to the technical field of display. The device comprises a display panel and a grating. The display panel comprises a plurality of display units arranged in array. The grating is obliquely arranged relative to the display units. The first display unit in the display units is used for displaying a first view. The second display unit in the display units is used for displaying a second view. Due to the fact that the inclined grating is designed, the first display unit in the display units is used for independently displaying the first view, and the second display unit in the display units is used for independently displaying the second view, the experience effect is effectively improved when small-and-medium size display products are used for naked-eye 3D transverse screen watching, and a crosstalk value and Moire patterns are greatly reduced.