The invention relates to a traditional Chinese medicine composition for preventing and treating porcine reproductive and respiratory syndrome, which is prepared from isatis root, folium isatidis, kudzu root, Chinese pulsatilla root, aconite, dried ginger, glycyrrhiza, astragalus membranaceus, codonopsis pilosula and gypsum. The Traditional Chinese medicine composition can be an oral liquid, and the preparation method of the traditional Chinese medicine composition comprises the following steps: (1), grinding the medicinal materials to 30 to 60 meshes, weighing and taking according to the formula, mixing three-dimensionally to obtain the traditional Chinese medicine powder; (2), adding the mixed traditional Chinese medicine powder into an extracting tank, adding 5 to 15 times of ethanol water and immersing for 2 to 10 hours, in which the weight ratio of ethanol to water is 1 to 1, and then filtering and collecting the leaching solution; (3), adding again 5 to 10 times of alcohol solution with ethanol and water in a weight ratio of 1 to 1, immersing for 2 to 10 hours, and then filtering and collecting the leaching solution; (4), mixing the leaching solution obtained in step 2 and the leaching solution obtained in step 3, vacuum concentrating at a temperature of 30 to 70 DEG C to 10 to 20 percent of the original volume; (5), bottle filling, 250 ml in each bottle to obtain the finished products. According to the traditional Chinese medicine composition for preventing and treating porcine reproductive and respiratory syndrome, porcine reproductive and respiratory syndrome can be effectively prevented and treated, and the cure rate reaches 90% above. The composition has the functions of clearing away heat and toxic materials, raising Yang, invigorating Qi and strengthening exterior and recuperating depleted yang.