The invention discloses a functional duck meat square leg and a preparation method of the functional duck meat square leg. The method comprises the steps of: slaughtering the duck, scalding hair, removing internal organs, cleaning, taking breast meat and leg meat, coating a mixture of nitrate, sodium isoascorbate and composite phosphate to pickle, adding a medlar juice and a walnut and lactoprotein mixed enzymatic solution, pig backfat, accessories, and glutamine transaminase and a lactic acid bacteria leavening agent, chopping, agitating and mixing uniformly, injecting in a mold way, preserving temperature and enzymolyzing, freezing and molding, demolding, packaging in vacuum, decocting and curing, sterilizing by microwave, and cooling to obtain the functional duck meat square leg which is rich in extracellular polysaccharide of lactic acid bacteria and polypeptide and amino acids. The method has the advantages that the amount of phosphate is reduced, and the emulsion stability, heat stability, water-retaining property and gel capacity of meat product are improved. The functional duck meat square leg is not only unique in flavor, but also has the functions of preventing oxidation, resisting angiotensin converting enzyme, and promoting calcium absorption and immune adjustment.