Problem to be solved. To provide a method for co-producing iodine and common salt which can efficiently co-produce iodine and common salt. Solution. A method for co-producing iodine and common salt that produces iodine and common salt using underground brine containing iodine salt and sodium chloride includes a series of steps including an iodine acquisition step, a brine production step of simultaneously concentrating the iodine salt and the sodium chloride using an electrodialyzer to obtain concentrated brine, and a brine evaporation step of acquiring common salt; and co-produces the iodine and the common salt. The order of the iodine acquisition step, the brine collection step and the brine evaporation step included in the series of steps includes various forms.
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