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Based on the finite-difference time-domain (FDTD) method, a wide-band solar absorber (WA) is constructed and simulated in this paper. Due to the Fabry-Perot resonance (FPR), the near-field resonance mode, the surface plasmon resonance (SPR) and gap resonance in different structure, the WA obtains efficient and wide-band absorption. The absorption efficiency in 373–1967 nm band is >90 %, and in 817–1830 nm band is >98 %, and the average absorption efficiency at air mass 1.5 (AM 1.5) reaches 91.10 % (280–2500 nm). The structure is insensitive to the change of incident angle. The reduced absorption efficiency is 9.23 % when the incident angle increases from 0° to 60°. In addition, the structure can work stably at high temperature, and the thermal radiation efficiency at 1500 K is as high as 85.13 %. Due to the efficient and wide-band absorption and high thermal emission efficiency, the WA can be widely used in solar energy collection and energy radiation. [Display omitted] • The bandwidth of the absorption efficiency ≥ 90 % is 1594 nm, and of the absorption efficiency ≥ 98 % is 1013 nm. • The average absorption efficiency of the structure at AM 1.5 is 91.10 %. • The thermal radiation efficiency of the structure is 85.13% % at 1500 K. [ABSTRACT FROM AUTHOR]