Abstract: The invention discloses a stereo-image display device. The stereo-image display device includes a light source, a polarization beam splitter, two image modulators and an image projection lens set. The light source is used for generating a parallel beam. The polarization beam splitter is used for splitting the parallel beam into two polarization orthogonal beams. Each image modulator is used for generating one visualized optical signal according to one of the beams and reflecting the visualized optical signal to the polarization beam splitter. Two visualized optical signals are to combine to one beam by the polarization beam splitter, and are projected through the image projection lens set onto a screen.