To realize high efficiency absorption of ultra-wide optical spectrum radiation from ultraviolet to infrared, it was designed that 0.2 μm~20 μm optical metamaterial absorption structure with high efficiency absorption. It was designed by the method of ultra-wide band partition set, 5 separate layers optimal design and non uniform sampling to get the parameters of equivalent resonant circuit of 3 scale 5 separate layers metamaterial absorption structure, and the structure parameters of each layer was obtained and the absorption property was analyzed and discussed. Simulation experimental results show that, the total thickness of metamaterial absorption structure is about 3.14 μm, the absorption efficiency is better than 89% in 0.2 μm~20 μm wavelength range, and the absorption bandwidth ratio is near 100%, which can satisfy the constrain requirement of frequency range and absorption efficiency. This method can realize coherent and continuous absorption structure design in ultra-wide band frequency range, with absorption band expanding 45.26% in each partition and with total absorption band expanding 81.57% more than expected, the absorption bandwidth ratio is about 85.11%, that absorption efficiency is better than 80%. It can be applied in ultra-wide spectrum detection and confrontation stealth.