The invention discloses a chlorination refining method for high-iron low-nickel sulphonium. The method comprises the following steps of chlorine leaching, first-stage hot-pressing copper removing, second-stage normal-pressure copper depositing, extraction for iron removing, neutralizing for deep iron removing, cobalt extraction and sulfate radical removing. The high-iron low-nickel sulphonium is leached through chlorine, then copper, iron, cobalt and other impurities are separated, finally a pure nickel chloride solution is obtained, and nickel, copper, iron and cobalt are enriched and separated efficiently with the low cost in a chlorination system; iron, as a pioneer, is obtained in a product form; precious metals are enriched in leaching residues and can be further recycled; copper is transferred to a copper pyrometallurgical system after being enriched; cobalt is transferred to a cobalt system after being enriched; and nickel is obtained as a pure nickel chloride solution capable of being used for producing electrodeposited nickel products or nickel chloride products. The whole technological process is easy to operate, and the operation cost is low; the loss of valuable metals is reduced, the direct recovery rates of nickel, cobalt, the precious metals and the like are high, wherein the direct recovery rate of the precious metals is larger than 95%, and the direct recovery rate of cobalt is increased by about 20% compared with a traditional pyrometallurgical process; and the waste water amount and the waste residue amount are little, and energy saving and environmental friendliness are achieved.