The invention belongs to the field of externally-used traditional Chinese medicines, in particular to an externally-used hot compress mud plaster for treating pains of a human body and a preparation method thereof. The externally-used hot compress plaster comprises the following raw materials: 10-15% of natural jade mud powder, 3-5% of tourmaline micro powder, 3-5% of far infrared ceramic micro powder, 15-25% of Chinese medicinal herb, 10-20% of mud plaster matrix, 25-35% of beeswax and 5-15% of red lead. The externally-used hot compress mud plaster is used for acupuncture points of the human body. The mud plaster is heated to melt; after about 10-15 minutes, the cooling melted mud plaster is sticked to a pain area after being cleaned, so as to activate the vigor of skins, and expel toxins of the skins. The hot compress mud plaster has the advantages of heat absorption and heat preservation, even heat dissipation, consistent temperature, can get through the meridians, dispel the wind and remove the cold, activate blood circulation to dissipate blood stasis, eliminate goiter and tumour, thoroughly remove the pain, treat headache, toothache, prosopalgia, sore-throat, chest and hypochondriac pain, epigastric pain, bellyache, gout, backleg pain and cerv shoulder pain, herniated disk, ischialgia, rheumatalgia, and spinal pain; and the plaster in the invention is convenient to stick to the different parts of the human body, does not harden and flow, solidifies after taking away from the human body, and can be reused by repeated heating.