The invention relates to a preparation method of a traditional Chinese medicine for treating pain type acute glomerulonephritis, belonging to the technical field of preparation methods of traditional Chinese medicines. At present, hydrochlorothiazide is generally adopted for treating pain type acute glomerulonephritis, but hydrochlorothiazide can easily cause hypokalemia which is usually accompanied with hypochloraemia and hypomagnesemia, and hypokalemia can induce hepatic coma, digitalis-induced arrhythmia and the like. The technical scheme adopted in the invention is as follows: taking camellia, common cephalanoplos herb, osbeckia chinensis, folium artemisiae argyi, cactus, hairyvein agrimony, rhizoma bletillae, furnace soil, carbonized human hair, rumex japonicus, marmor serpentinatum,radix boehmeriae, madder, common sage herb, flower of hollyhock, eclipta, pericarpium citri reticulatae viride, syzygium aromaticum, fiveleaf akebia fruit, fructus anisi stellati, kamuning, aspongopus, sword bean, elecampane, szechwan Chinaberry fruit, mysorethorn, the root of three-nerved spicebush, rhizoma nardostachyos, ambergris, radix clematidis, gelsmium elegans, cortex periplocae and liquorice, soaking the traditional Chinese medicines in water, and decocting with slow fire, wherein the decocted liquid medicine is the traditional Chinese medicine for treating pain type acute glomerulonephritis. The prepared traditional Chinese liquid medicine has the advantages of little toxic and side effect, short course of treatment and high cure rate.