The invention relates to the field of 3D display technology, and in particular, to a 3D display device and a 3D calibration device and a 3D calibration method. The 3D display device comprises a frontcamera, 2D display panel, an external fixing device, a 3D raster panel, a 3D display unit and a 3D calibration unit. The 3D calibration device is also a kind of packaging box, the packaging box is a heaven and earth cover type, a supporting device is attached to the interior of the box body for supporting and fixing the box cover at a certain height, an optical reflection lens is arranged on the inner surface of the box cover, the display screen of the 3D display device is flatly placed in the box body, the camera is aligned to the lens in the box cover, the 3D display unit displays a featurepattern sequence through the screen, and shoots a mirror sequence of the feature patterns, and the 3D calibration unit processes the image sequence and obtains preferred 3D display parameters. The invention provides an inexpensive 3D display scheme and an automatic calibration scheme, which is beneficial to the promotion of 3D products.