1. A stereoscopic display apparatus comprising: first image displayer, for projecting a first image light; second image displayer, for projecting a second image light; an aspherical reflection mirror, for refracting said first image light and said second image light, and for changing a polarity of said first image light and said second image light; a beamsplitter, disposed within said first image displayer, said second image displayer and said aspherical reflection mirror, for deflecting the proceeding path of said first image light and said second image light based on said polarity of said first image light and said second image light; an opaque plate, for projecting said first image light and said second image light, thus forming a first image and a second image thereon; and a housing, for containing said first image displayer, said second image displayer, said aspherical reflection mirror, said beamsplitter and said opaque plate, said housing having at least one opening for an operator to inspect said first image and said second image.