The invention discloses a cool and refreshing chafing dish soup base capable of decreasing internal heat and a preparation method therefor. The cool and refreshing chafing dish soup base consists of the following raw materials in parts by weight: 30-40 parts of old duck soup, 6-8 parts of tomatoes, 5-7 parts of lotus roots, 3-5 parts of corns, 1-3 parts of bitter gourds, 3-5 parts of glutinous rice, 6-7 parts of Chinese yam, 3-4 parts of funguses, 1-3 parts of chrysanthemum flowers, 2-4 parts of dendrobium, 2-4 parts of radix isatidis, 2-4 parts of leaf mustard, 3-5 parts of lilies, 1-3 parts of corn stigmas, 4-6 parts of radishes, 2-3 parts of rhizoma coptidis, 2-4 parts of rhizoma anemarrhenae, 2-4 parts of ginger slices, 2-4 parts of capsicum frutescens, 1-2 parts of cooking wine, 1-3 parts of bay leaves, 3-5 parts of soy sauce, 2-3 parts of five spices, 1-2 parts of green onions, 2-4 parts of vinegar, 1-2 parts of chicken essences and 4-6 parts of salts. The Chinese herbal medicines of the chrysanthemum flowers, the dendrobium, the radix isatidis, the leaf mustard, the corn stigmas, the rhizoma coptidis and the rhizoma anemarrhenae are added into the old duck soup, and medicinal and edible raw materials are reasonably collocated, so that the cool and refreshing chafing dish soup base has the medicinal values of strengthening immune regulation, appetizing and tonifying spleen, improving looks, and preserving health, is fragrant in taste and good in internal heat decreasing effect.