The invention discloses an adsorption resin for removing perfluorinated pollutants in water bodies, as well as its preparation and application. The purpose is to solve the problems of traditional adsorption materials, such as activated carbon materials, which have poor removal effect on perfluorooctanoic acid in water and cannot be regenerated. This method adopts styrene and divinylbenzene as skeleton materials, selects suitable porogen and dispersant to prepare macroporous resin with moderate pore size, uses p-dichlorobenzyl (XDC) as post-crosslinking agent, and generates alkanes under low steric hindrance. Based reaction, the rigid benzene ring structure is introduced into the resin through post-crosslinking, further increasing the hydrophobicity of the resin, increasing the degree of crosslinking, adjusting the microporous structure, and obtaining an adsorption resin with narrow particle size distribution, uniform pore size and high specific surface area. The mesopore size is close to the molecular size of perfluorooctanoate in water, and it has a strong ability to screen adsorbates, which can further increase the adsorption rate of perfluorinated compounds.