The invention relates to a strong-acid-resistant magnetic adsorption particle. The magnetic chelation adsorption particle using silane for coupling a hydrophobic layer and coating polymers for enhancing the acid-resistant performance has a coating structure formed by an Fe3O4 magnetic particle, an amorphous silicon oxide, a hydrophobic layer and a high-molecular polymer layer from the core to the case; the high molecular polymer layer has metal ion adsorption functional groups; the hydrophobic layer is formed by hydrolyzing alkylalkoxy silane and performing coating to form an adsorbent grafted with 6-methylene amino carboxyl-1-hydroxyl-2-(1H)-pyridyl ketone; iron in metal salts can be removed through adsorption under the sulfuric acid and hydrochloric acid conditions being higher than 3M; regeneration and repeated use can be realized.