A display device and a holographic display implementation method thereof. The method comprises: employing a first lens array (5) comprising a plurality of first lenses (51) arranged sequentially in a matrix, wherein the first lenses (51) respectively correspond to a plurality of viewing windows (VW) arranged on light-emerging paths; employing a slit array (41) comprising a plurality of slits (41) arranged in a matrix and respectively corresponding to the first lenses (51); employing an optical spatial modulator (2) to load a holographic image; employing a eye tracker (8) to track a location of a human eye; and after employing a controller (7) to determine according to the location of the human eye a view window (VW), controlling a deflection component (3) to redirect, to a slit (41) corresponding to a first lens (51) corresponding to the view window (VW), an emergent light output from the optical spatial modulator (2), and controlling a deflection angle of the first lens (51) to focus emergent lights of the f
