A virtual reality stereoscopic image expansion device with high definition where 1 to 2 monitors are provided in an independent rotary case, first or first and second left and right reflectors having reflective refraction angles of 90° in left and right directions of stereoscopic left and right eye images are provided and configured as left and right lenses for matching optical axes so that the image center of the large monitor having a screen size of a human pupil interval or more is matched with the interval between the left and right eyes of the observer by coupling the optical axes of the monitors and the reflectors with an optical structure. Thereby it makes it possible to observe the stereoscopic image by a general monitor without structures of the polarizer and the translucent mirror.