An ultra-wideband omni-directional metamaterial absorber based on dome-cone-shell array was proposed. The influences of the geometric parameters of dome-cone-shell, the shape of the top and the different packing modes on the wideband absorption were studied. The ultra-wideband absorption characteristics of a metal-coated dome-cone shell array in the solar radiation spectrum are studied. The results show that the average absorption rate in the range of 250~2500nm reaches 95.39%. The average absorptivity for TE and TM polarization is 92.7% and 94.59%, respectively, at a large incidence angle from 0° to 65°, indicating that the proposed structure is polarization independent and incident angle insensitive. The weighted average absorption rate of air mass 1.5 is 95.24%, proving that it can effectively absorb solar radiation on earth. The proposed absorber was successfully prepared by combining colloidal ball lithography and surface coating. Primary test results show that the absorption performance still needs to be improved.