Abstract: A stereo-image display device is disclosed in the invention. The stereo-image display device includes a polarization beam splitter, an image projection lens set, a first image unit and a second image unit. The first image unit is used for generating a first visual optical signal to the polarization beam splitter. The second image unit is used for generating a second visual optical signal to the polarization beam splitter. A polarization direction of the second visual optical signal is orthogonal to a polarization direction of the first visual optical signal. Two visual optical signals are combined to one beam by the polarization beam splitter, and are projected through the image projection lens set onto a screen.