The present disclosure discloses a solid amine material absorbing CO2, preparation method, and application thereof, including a porous carrier and water-resistant organic amine loaded on the porous carrier. The water-resistant organic amine includes a biomass-derived polyhydroxyl compound, hydrophilic organic amine and hydrophobic organic amine combined with the biomass-derived polyhydroxyl compound at the same time. The biomass-derived polyhydroxyl compound comprises a six-membered ring structure, with good water resistance and CO2 adsorption effect.