The invention discloses a method for recovering iodine from concentrated phosphoric acid which is produced by wet-process phosphoric acid; the method comprises the following steps of: extracting the iodine from the concentrated phosphoric acid produced in the production process of phosphorous ore which contains iodine, wherein, the concentrated phosphoric acid contains 50 to 110 mg/L of the iodine and 40 percent to 52 percent of P2O5; adding 27 percent to 35 percent of hydrogen peroxide water solution into the phosphoric acid as an oxidizing agent for reaction; using air to blow out the molecular iodine of the phosphoric acid; then absorbing the molecular iodine by acid solution containing liquid SO2 with the PH value of the absorbing solution ranging from 1 to 6; adding hydrogen peroxide and leading the iodine to be precipitated; carrying out filtering and separation and obtaining the finished iodine. The applicant finds that the iodine is extracted from the concentrated phosphoric acid after the diluted phosphoric acid is concentrated into the concentrated phosphoric acid; as the material liquid is concentrated, the concentration of the material iodine is high, the solution impurity is little and the content of the reducible matter and the organic matter is low, therefore, the usage of the oxidizing agent can be reduced; the method of the invention has the advantages of high concentration of the material iodine, little usage of the oxidizing agent, easy extraction, high recovery rate and low production cost.