The invention relates to a black hot pot base and a preparation method, which solve the problems of discomfort of intestines and stomach caused by spicy and irritant flavor of the conventional red hot pot and high probability of adsorbing smell to clothes existing in the prior art. The hot pot base comprises the following raw materials in parts by weight: 40-50 parts of plant oil, 6.5-8.5 parts of old ginger, 6.5-8.5 parts of garlic, 23-26 parts of black pepper, 0.05-0.2 part of Szechuan Lovage rhizome, 0.1-0.2 part of cardamom, 0.2-0.3 part of semen myristicae, 0.1-0.25 part of fructus amomi, 0.15-0.2 part of aniseed, 0.2-0.6 part of fennel, 0.1-0.2 part of cassia bark, 2-5 parts of fermented glutinous rice, 2-5 parts of black pepper and 5.5-8 parts of small materials. The color of the hot pot base is black; fresh black pepper is selected and used, so that the hot pot base has unique faint scent and cooler mouthfeel, is non-greasy, is in the form of flowing liquid and does not solidify; the fresh black pepper is rich in vitamins and contains a special substance, so that metabolism can be quickened, hormone secretion is promoted, skin is protected, vitamin C and various antibacterial substances are enriched, cholesterol is reduced, natural flavor is kept in a frying process, and the nutrient substances and the effects of the hot pot base are remained as much as possible.