To provide a method for purifying a rhodium-containing solution, which has a good purification effect, and a high recovery rate of rhodium; and to provide a method for producing a rhodium nitrite salt containing only a small amount of impurities from the purified rhodium-containing solution.

The method for purifying a rhodium-containing solution is configured such that in a process of adding a nitrite salt to the rhodium-containing solution to recover rhodium nitrite complex ions, the rhodium-containing solution containing ammonium ions is adjusted at a pH of ≥1, and thereafter added with a nitrite salt; while the liquid temperature is maintained at ≤40°C and pH is maintained at ≤7, the solution is stirred for ≥1 hour to progress production of rhodium nitrite complex ions and decomposition of ammonium ions; then, the liquid temperature is raised to ≥70°C, and the solution is stirred for ≥1 hour to further progress production of rhodium nitrite complex ions, and also to precipitate the dissolved metal; and the produced precipitate is subjected to solid-liquid separation, and the purified rhodium nitrite complex ion solution is recovered.

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