The invention discloses a treatment technology of low-content radioactive pollutants in rare-earth smelting wastewater, and belongs to the technical field of radioactive wastewater treatment. According to the technology, the rare-earth smelting wastewater is adjusted to be neutral or slightly alkaline, and barium ions and sulfate ions are added, so that radium and other radioactive substances in the wastewater are primarily removed through co-precipitation; by adding a flocculating agent, precipitation is accelerated, and the time and cost required by precipitation are reduced; at the same time, a small part of low-content radioactive substances still existing after precipitation are further adsorbed and removed by using a fixed activated carbon adsorption bed, and after technical treatment, the radioactive substances in the wastewater can be discharged up to the standard. According to the technology, the characteristics of different treatment modes are fully utilized, the process costis reduced and the treatment efficiency are improved while the low-content radioactive pollutants in the wastewater are reduced and removed, and the application value is remarkable.