The invention relates to a method for preparing syrup for tonifying spleen, reinforcing kidney, nourishing blood and preventing abortion. The method comprises the following steps of: (1), an extraction process: 1, preparation of raw materials and weighing: weighing common yam rhizome, himalayan reasel root, astragalus mongholicus, Chinese angelica, rhizoma cibotii (deburred), semen cuscutae, parasitic loranthus, eucommia ulmoides (fried), fructus psoraleae, dangshen roots, poria cocos, bighead atractylodes rhizome (burnt), donkey-hide gelatin, rehmannia, dogwood, the fruit of Chinese wolfberry, dark plum, white paeony roots, fructus amomi, alpinia oxyphylla, ramie roots, baical skullcap roots and argy wormwood leaves according to a certain weight ratio, 2, extraction: soaking donkey-hide gelatin and other rest of 22 medicines for 4 hours with warm water at 50-60 DEG C, filtering, and adding filtering liquid into the donkey-hide gelatin and condensing mixed solution to each 1ml of condensing liquid to contain 1g of crude medicine, and 3, deposition: condensing the filtering liquid to form medicinal concoction; and (2), a preparation process: 1, mixing and weighing: taking the medicinal concoction, NaOH and cane sugar, honey, sodium benzoate and ethylparaben according to a certain weight ratio, and 2, decocting. The method has the advantages that the syrup with good quality is acquired.