Expanded feed for promoting weight reduction of grass carp as well as preparation method thereof

The invention belongs to the field of grass carp feeds and discloses an expanded feed for promoting weight reduction of grass carp as well as a preparation method thereof. The expanded feed consists of the following components in percentage by mass: 4 to 10 percent of flour, 4 to 10 percent of corns, 5 to 15 percent of cassava, 8 to 15 percent of rice bran, 5 to 12 percent of soybeans, 10 to 15 percent of bean pulp, 20 to 25 percent of rapeseed meal, 6 to 12 percent of cottonseed meal, 3 to 6 percent of Baijiu vinasse, 2 to 5 percent of fish meal, 2 to 5 percent of meat meal, 1.5 to 2.5 percent of soybean oil, 1 to 2 percent of a zeolite powder, 2 to 3 percent of monocalcium phosphate and 2 percent of premix. Through multi-validation, the grass carp achieves a good weight-reducing effect,the growth is not influenced, the internal organs such as liver are healthy, and transportation resistance is achieved. Through reasonable matching of the soybean, the bean pulp, the rapeseed pulp, the fish meal, the meat meal and the like, the protein content and the fat content of the feed are moderate, and the fatness of the grass carp eating the feed is 1.9 to 2.3 percent.