The present invention provides a three-dimensional display device and display control method thereof, wherein controlling a plurality of backlight units to activate simultaneously when a lowermost display area receiving drive signal of an image frame and when the liquid crystal in the lowermost display area completely responded, and each of backlight units being closed when corresponding display area starting to receive another image frame; wherein drive current of the backlight unit corresponding to each display area being used to control the luminance of each display area. With this, the present invention can reduce the crosstalk caused by the three-dimensional display device, resulting in the reduction of residual image and improving the three-dimensional display effect and viewing experience.