Solar simulator optical system

The invention discloses a solar simulator optical system. The solar simulator optical system includes a xenon lamp, an ellipsoid surface condenser, a first plane reflecting mirror, an optical integrator, an optical filter, a second plane reflecting mirror, an off-axis parabolic reflecting mirror and a shell; the xenon lamp is located at the first focus of the ellipsoid surface condenser; the optical integrator is of a symmetric structure and is composed of two sets of element lens arrays, wherein the front set of lenses is an integrator field lens which is located at the second focus of the ellipsoid surface condenser, and the back set of lenses is an integrator projection lens which is located at the front focal plane of a collimating mirror; and the off-axis parabolic mirror is the system collimating mirror. According to the solar simulator optical system, two plane reflecting mirrors are adopted, so that an optical path can be effectively folded, and the size of the optical path can be compressed; the system is an off-axis reflecting collimating system, and therefore, the collimating angle of a light beam is larger, and radiation uniformity is high, and central obscuration of an outputted light beam can be avoided; and a framework built by the system is a 4-shaped mirror image, and with such as an optical path structure realized, the center height of an outgoing light beam can be flexibly adjusted according to design requirements.