The present invention discloses a purely natural medicine, which is used for treating thalassemia and is made by extracting effective active ingredients of marine lifen and a plurality of types of medicinal materials. The formula comprises the following weight percent: 10 percent of sea cucumbers, 10 percent of sea mud worms, 10 percent of Pelamis platurus, 7 percent of oyster, 7 percent of spirulina, 7 percent of Angelica, 7 percent of radix astragali, 7 percent of large ginseng, 7 percent of prepared rhizome of rehmannia, 7 percent of fructus broussonetiae, 7 percent of leatherleaf milletia, 7 percent of Psoraleae, and dried human placenta. The purely natural medicine has the effects of restoring the hematopoietic function, enhancing the level of hemoglobin (Hb), improving the clinical symptoms, and raising the quality of life. Moreover, the medicine has significant curative effects on alpha thalassemia and beta thalassemia, and has the capability of improving the Hb level, the clinical symptoms and the quality of life. The total efficiency of curative effects can reach 93.55 percent.