The invention discloses a large-exit-pupil large-visual-field augmented reality system comprising a prism with three optical working surfaces, a semitransparent mirror and an image displayer. The three optical working surfaces of the prism are a first optical working surface, a second optical working surface and a third optical working surface respectively. Light rays emitted by the image displayer are incident to the prism in a transmission way through the first optical working surface and then reflected by the third optical working surface and then reflected by the second optical working surface and then incident to the third optical working surface in the transmission way and finally reflected into the human eyes through the semitransparent mirror. The light rays, which are away from the side of the human eyes, of the semitransparent mirror are incident into the human eyes in the transmission way through the semitransparent mirror. The large-exit-pupil large-visual-field augmented reality optical system has the advantages of being compact in structure, large in exit pupil distance, large in visual field, large in range of eye movement, great in whole-visual-field aberration correction and high utilization rate of optical energy.