To provide a method for recovering iodine from waste fluids from a polarizing film production process which can easily and efficiently recover iodine and boron from waste fluids in a polarizing film production process.

The waste fluid in polarizing film production contains 2-35 g/l of iodine in terms of the total amount of iodine, 0.2-8 g/l of boron, and 0.6-11 g/l of potassium. The waste fluid is adjusted to have a pH of less than 7 and then subjected to electrodialysis by an electrodialyzer 1 to separate iodine as potassium iodide to reduce the total amount of iodine in the waste fluid to 0.5 g/l or less. Next, the waste fluid after the electrodialysis is passed through a strongly basic anion-exchange resin 6 to allow the remaining iodine to be adsorbed to the strongly basic anion-exchange resin 6 to reduce the total amount of iodine in the waste fluid to 0.01 g/l or less. Then, iodine is recovered from the potassium iodide and the strongly basic anion-exchange resin 6.

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