The invention discloses a novel medicine for treating cervical tuberculous lymphadenitis and a preparation method thereof. The novel medicine comprises the following components in parts by weight: 1-5 parts of sargassum pallidum (seaweed), 1-5 parts of oyster, 1-5 parts of poria cocos, 1-5 parts of pinellia ternate, 1-5 parts of kelp, 1-5 parts of liquorice, 1-5 parts of platycodon grandiflorum, 1-5 parts of pericarpium citri reticulatae, 1-5 parts of semen brassicae, 1-5 parts of kiwi fruit (kiwi fruit root), 1-5 parts of bolbostemma paniculatum (rhizoma bolbostemmae), 1-5 parts of mock-strawberry, 1-5 parts of potentilla discolor, 1-5 parts of tall monkshood root and1-5 parts of persicaria perfoliata. The preparation method of the medicine comprises the following steps: A, selecting the following high-quality and clean raw materials: 1 part of sargassum pallidum (seaweed), 1 part of oyster, 1 part of poria cocos, 1 part of pinellia ternate, 1 part of kelp, 1 part of liquorice, 1 part of platycodon grandiflorum, 1 part of pericarpium citri reticulatae, 1 part of semen brassicae, 1 part of kiwi fruit (kiwi fruit root), 1 part of bolbostemma paniculatum (rhizoma bolbostemmae), 1 part of mock-strawberry, 1 part of potentilla discolor, 1 part of tall monkshood root and 1 part of persicaria perfoliata, and cutting into slices or segments for later use; and B, putting the cut slices or segments into a cloth bag, tying up, soaking in a container for 30 minutes, putting the soaked traditional Chinese medicines and a filter screen into a medicine decocting pot, adding a proper amount of clean water, decocting for 50 minutes in total by a high fire and a slow fire, filtering out 1620ml of traditional Chinese medicine liquid after the medicine is well decocted, packaging and sealing, so as to obtain the medicine.