The work aims to study the effects of space irradiation environment on the properties of SCB-1 stray light coatings. Simulated space environment test of SCB-1 stray light coatings was conducted with vacuum-ultraviolet dose of 5000 ESH, vacuum-proton radiation flux of 2.5×1015 p/cm2, vacuum-electron radiation flux of 2.5×1016 e/cm2 and atomic oxygen dose of 2.0×1021 atoms/cm2. The changes in the solar absorptionαS and hemispheric emissivityεH of the coatings before and after the space irradiation test were analyzed. The state changes of surface elements of the coatings were detected by X-ray photoelectron spectroscopy (XPS) to judge the stavility of SCB-1 coatings under dfferent radiation factors.After vacuum-ultraviolet irradiation, the solar absorption of the SCB-1 coatings in the full-wave band decreased by 0.007~0.009, and the solar absorption in 400-1100 nm decreased by 0.008~0.01. After atomic oxygen radiation, the solar absorption in both the full-wave band and 400~1100 nm decreased by 0.006~0.009. After vacuum-proton radiation, the solar absorption in the full-wave band and 400~1100 nm decreased by 0.004~0.005 and 0.005 respectively. After vacuum-electron radiation, no significant change was found in the absorption. There was no significant change in the hemispheric emissivity of SCB-1 coatings during the above irradiation processes. The simulated space irradiation experiment demonstrates that the SCB-1 stray light coatings have excellent stability against space irradiation. They can meet the needs on design of long service life spacecraft such as LEO and GEO.