The invention relates to a solar simulator adopting a composite refrigeration mode. The system comprises a combined refrigeration system and multiple paths of xenon lamp projection optical systems, each path of the xenon lamp projection optical system comprises a xenon lamp group used for a generating system light beams and an optical integrator used for homogenizing the corresponding system lightbeam, and the system light beams are superposed on a lighted surface to form a uniform irradiation area so as to simulate solar irradiation. The combined refrigeration system comprises a circulatingair cooling subsystem and a circulating water cooling subsystem, the xenon lamp set is cooled in an air cooling mode, other parts are cooled in a water cooling mode, and it is guaranteed that the solar simulator can stably work for a long time.