The invention discloses a method for enriching indium from a low-indium zinc smelting material. Acid leaching and indium precipitating are repeatedly conducted on neutralizing hydrolyzing indium precipitating slag, thus, indium in indium-containing acid leach liquor is enriched, when the content of the indium in the indium-containing acid leach liquor is larger than or equal to 2000 mg/L, high-indium liquor of an open circuit part is subjected to neutralizing hydrolyzing indium precipitating and pickling, an indium-rich slag open circuit is produced, and the grade of the indium slag reaches 50000 g/t. The indium enriching method provided by the invention is not influenced by the grade of the indium contained in the raw material, indium-rich slag high in indium content is produced, no impurity except system ions is introduced in the production process, poisonous and pernicious gas pollution is avoided, the amount of the indium-rich slag is small, and the loss of valuable metal is small.