Proposed is a stereoscopic image screening device, comprising: a polarized light splitter for spatially splitting and irradiating an image light irradiated from a projector into transmitted light andone or more reflected lights according to polarization components; a first modulator for irradiating the transmitted light on a screen by performing modulation in a way allowing different polarizations as the transmitted light is alternately irradiated to a left image or a right image in a time-division scheme; and a second modulator for irradiating the reflected light on the screen by performingmodulation in a way allowing different polarizations as the reflected light is alternately irradiated to a left image or a right image in a time-division scheme, wherein the first modulator and the second modulator are set in a manner that the phase delay of the first modulator is any one of 0 lambda and 1/2 lambda, and the phase delay of the second modulator is the other one of 0 lambda and 1/2 lambda at a specific point of time.