Since traditional solar simulators are mainly applied to spacecraft and photovoltaic industry, they are not suitable for solar radiation measuring instrument test. Therefore, a deep research is carried out on solar simulators to test of solar radiation measuring instrument, so that obtain the requirements of performance test of solar radiation measuring instrument. With a combination of the requirements for national regulations of metrological verification and performance test of pyranometer and pyrheliometer, it lays emphasis on the research of design methods for improving radiation uniformity and stability of solar simulators; it also focuses on design methods of multidimensional detection workbench, which achieves different detection of solar radiation. After practical test, solar irradiation is within Φ60mm; irradiation non-uniformity is better than ±0.8%; instability is better than ±0.72%; rotating angle precision is better than 0.09°. Then, solar simulator is used to carry out pyranometer sensitivity test, pyranometer directional response test, pyranometer tilt response test and non-linearity test for radiation instruments. Test results show that the solar simulator meets the testing requirements of solar radiation measuring instruments.