The invention discloses a preparing method of kidney-tonifying qi-benefiting seasoned duck. The preparing method comprises the following steps of: frying salt, anise and Sichuan peppercorn according to proportion until the mixture turns yellow, salting the duck and the yellow ingredients at low temperature according to proportion, taking Chinese herbal medicine according to weight part and mixing, adding water, placing for 30-35 minutes at normal temperature, adding water again, boiling to obtain traditional Chinese medicine extracting solution, placing in soaking equipment, placing the treated duck, soaking and drying, stirring thick broad-bean sauce, soy and water according to proportion for blending sauce, carrying out vacuum massage on the dried duck while applying the sauce, and drying 2-3 hours in a drying room after massaging for 30-50 minutes, thus obtaining a finished product. The kidney-tonifying qi-benefiting seasoned duck prepared by the invention is uniform in salting and good in mouth feeling and has a kidney-tonifying qi-benefiting dietary-therapy health-care function.