The invention discloses a traditional Chinese medicine (TCM) extract for treating idiopathic thrombocytopenic purpura (ITP). The TCM extract comprises the following components in parts by weight: 24-26 parts of rehmannia glutinosa, 24-26 parts of Chinese yam, 10-12 parts of folium mori, 10-12 parts of barbary wolfberry fruit, 28-32 parts of eclipta prostrata L., 10-14 parts of glossy privet fruit, 22-25 parts of agrimony, 28-32 parts of calcined dragon bone, 14-16 parts of salvia miltiorrhiza, 10-14 parts of white paeony root, 14-16 parts of radix rehmanniae, 9-11 parts of fried great burdock achene, 0.8-1.0 part of antelope horn cornu saigae tataricae, 8-10 parts of fructus forsythiae, 4-6 parts of liquorice, 14-16 parts of chrysanthemum and 9-10 parts of peach seeds. The TCM extract is taken through decoction with water, has the functions of clearing away heat and toxic materials, cooling blood to remove stasis and tonifying qi, nourishing yin and reinforcing kidney and has good treatment effect, high recovery rate, low recurrence rate and no toxic or side effect when being used for treating purpura.