The invention discloses a fleshy duck fodder and a preparation method thereof. The fleshy duck fodder comprises the following components in parts by weight: 50 to 65 parts of corn, 12 to 25 parts of fine rice bran, 2.5 to 12 parts of cotton dregs, 2 to 12 parts of rapeseed meal, 1 to 6 parts of corn alcohol dregs, 0.5 to 2 parts of corn oil, 0.5 to 2 parts ns of rock powder, 0.2 to 1.5 parts of calcium phosphate secondary, 0.1 to 0.6 part of common salt, 0.2 to 0.8 part of lysine with the consistence of 65%, 0.05 to 0.25 part of methionine, 0.04 to 0.2 part of threonine, 0.01 to 0.1 part of tryptophan, 0.05 to 0.2 part of miscellaneous meal enzyme and 0.5 to 2 parts of premix compound. In the fodder, bean dregs are replaced by the cotton dregs and rapeseed meal, single amino acid and miscellaneous meal enzyme are added, the feed costs of fleshy ducks are greatly reduced, the feed effect to the fleshy ducks is better than the fodder with the bean dregs, the production performance of the fleshy ducks can be obviously enhanced, and the invention has the advantages of wide resources of raw materials, low production cost, high feed efficiency, and the like.