PROBLEM TO BE SOLVED: To provide a method for treating radioactive liquid waste, which can reduce the concentration of radioactive substances and reduce the amount of radioactive waste containing α-nuclide having a super half-life. SOLUTION: This is an α-nuclide removal system for treating radioactive effluent containing α-nuclide, and a water quality adjusting device for adjusting the water quality of the radioactive effluent containing α-nuclide, and an α-nuclide after the water quality adjusting device has adjusted the water quality. It is equipped with an adsorbent injection device that injects an α-nuclide adsorbent into a radioactive liquid containing, and an α-nuclide removal device that removes α-nuclide from the radioactive liquid by adsorbing α-nuclide with an α-nuclide adsorbent. The adjusting device is configured to adjust the water quality so as to reduce the concentration of α-nuclide. [Selection diagram] Fig. 2
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