The invention discloses a light and small coaxial-like five-reflex optical system with a large field of view and low distortion, and relates to the field of aerospace optical remote sensors. The lightand small coaxial-like five-reflex optical system with a large field of view and low distortion comprises an aperture diaphragm, a primary mirror, a secondary mirror, a third mirror, a fourth mirror,a fifth mirror and a plane mirror; the light passes through the primary mirror, the secondary mirror, the plane mirror, the third mirror, the fourth mirror, the fifth mirror in turn to form an imageon an image surface; the aperture diaphragm is located on the primary mirror; the primary mirror is inclined with respect to an optical axis of the light incident on the primary mirror; the plane mirror, the third mirror, the fourth mirror, and the fifth mirror are all located behind the primary mirror; the primary mirror is a quadric surface; the secondary mirror, the third mirror, the fourth mirror and the fifth mirror are all high-order spherical surfaces; and the primary mirror and the secondary mirror constitute a concave reflector group. The invention has the characteristics of small size, low cost, low distortion, large field of view, wide spectral range, no obstruction, long focal length, etc., and can realize high-precision ground detection and mapping, is especially used as a high resolution camera with a small size and low cost of a micro-nano satellite.