The invention provides a method for processing polygonum multiflorum black sesame oil, which is characterized by comprising the following steps: cleaning, slicing, steaming, drying, dust scrubbing and sterilizing polygonum multiflorum, then adding the polygonum multiflorum into skimmed hot sesame oil by adding pulp, controlling the temperature and extracting, and finally filtering the mixture, thus obtaining a finished product. In the method, ingredients of lecithin, glucoside and the like in the polygonum multiflorum, which have health care function on a human body, are extracted in sesame oil, thus greatly improving the health care value of the sesame oil when being eaten singly. The method has simple process; and the produced polygonum multiflorum black sesame oil can moisture skin, nourish liver and kidney, benefit essence and blood, has subastringent and flavoring taste, and can be taken as daily appetizer or edible oil, is convenient for eating and has special health care function.