The invention discloses a preparation method of heat clearing dampness draining health care edible oil, and the preparation method is as follows: according to a certain weight ratio, evenly mixing flaxseed, fructus perillae, pinenut kernel and kardiseed, and putting the mixture into a traditional Chinese medicine decoction liquid of isatis root, desmodium, oldenlandia diffusa, solanum melongena root, radix paeoniae rubra, malt, white gourd leaf and the like for boiling for 20-30min by using soft fire, filtering, concentrating a filtrate, drying into powder by low temperature freezing, draining off moisture in the mixture, first using intense fire to fry the mixture for 2-3min, then using moderate and soft fire to fry for 3-5 min, then rolling into a material blank while the mixture is still hot, successively steaming, frying, squeezing and refining to obtain refined edible oil, adding freeze-drying powder, boiling and cooking, then finely filtering, cooling, bottling, sealing and packaging to obtain a finished product. The edible oil is rich in nutritional ingredients, contains a plurality of Chinese herbal medicine components, has the effects of clearing heat and draining dampness, invigorating the spleen and benefiting the stomach, nourishing the lung and moisturizing dryness and the like, and can be used for the prevention and treatment of lower abdomen distension, muddy red urine, frequent urination acerbity pain, endless and unsmooth urine, yellow and greasy tongue fur and other symptoms.