Solar simulator is a key equipment in the research of photovoltaic and material degradation, which can provide stable and controllable characteristic irradiance spectrum for light immersion and durability testing. Based on the high-power single-crystal narrow-band small-emitting surface LED light source, a super-hemispherical homogeneous lens is used to collect light in full aperture, and the distributed optical structure of the curved surface is designed, so as to achieve efficient spectral matching on the target surface and irradiance of one solar constant (irradiance of 100 mW/cm ²). The experimental results show that the irradiance fluctuation of the solar simulator designed in this paper is less than 1.15% within 1000 h, the irradiance non-uniformity in the square area of 60 mm×60 mm in the center of the target surface is 1.98%, the irradiance non-uniformity in the 80 mm×80 mm region is 4.99%, and the spectral matching of light spot reaches class A. The system has compact structure and strong expansibility, and can be used for long-term steady-state measurement.