Organic amines such as polyethyleneimine and tetraethylenepentamine. Solid amine adsorbents mainly need to have high thermal stability and carbon dioxide adsorption capacity. However, organic amines such as polyethyleneimine and tetraethylenepentamine meet the requirements, including the same material of these two materials. Solid amine adsorbent is a kind of solid adsorbent based on organic amine modified porous materials.