A series of porous aromatic crosslinked polymers HCP-PhH-(1-3) with high specific surface area were synthesized by Friedel-crafts alkylation reaction with benzene as the reaction monomer and Dimethoxymethane (FDA) as the crosslinking agent, changing the molar ratio between the monomer and the crosslinking agent to regulate the pore structure of the polymer. The polymers were characterized by nitrogen adsorption desorption, thermogravimetry and FT-IR. The polymer showed abundant pore structure and good stability. The adsorption behaviors of tryptophan, phenylalanine and phenylglycine were studied. The experimental results show that the polymer HCP-PhH-3 synthesized when the molar ratio of monomer benzene to crosslinking agent FDA is 1: 5 has a relatively large specific surface area of 901.498m2/g, and at 25 ℃, for pH=7, the concentration is 1.5mmol/L amino acid solution has great adsorption capacity, and the adsorption amounts are tryptophan (0.199mmol/g), phenylalanine (0.140mmol/g) and phenylglycine (0.034mmol/g), respectively with obvious adsorption effect. The kinetic fitting of hcp-phh-3 adsorption process of amino acids was carried out, and the linear fitting correlation R2 conformed to the quasi second order kinetic model.