The invention provides application of a sandworm culture in precipitating rare earth, and a sandworm-culture rare earth precipitation solution, and particularly discloses the application of the sandworm culture in precipitating the rare earth and preparing the rare earth precipitation solution, and the sandworm-culture rare earth precipitation solution prepared through inoculating sandworms to a culture medium adopting kelp and marine organism shell lime as raw materials. By utilizing the sandworm-culture rare earth precipitation solution provided by the invention for precipitating the rare earth, the ammonia nitrogen pollution can be effectively avoided, and the problem of the soil and water environment pollution is severe during the rare earth separation process is solved.