The present invention discloses a rapid trionyx sinensis fattening feed and a preparation method, wherein the raw materials comprise, by weight, 400-500 parts of fly maggot, 200-300 parts of tubificidae, 50-70 parts of soybean meal, 40-60 parts of peanut meal, 30-40 parts of sorghum, 10-20 parts of paddy, 10-20 parts of beer lees, 2-3 parts of polygonum multiflorum thunb, 2-3 parts of cyrtomium fortunei, 2-3 parts of fructus aurantii, 1-2 parts of cortex mori, 1-2 parts of perilla, 50-70 parts of melons and fruits, 50-60 parts of apple seeds, 10-20 parts of whey powder, 8-10 parts of pineapple powder, 5-6 parts of tuber onion seed powder, 4-5 parts of rape pollen, 4-5 parts of solanum melongena seed powder, 2-3 parts of shell powder, 1-2 parts of a pyroligneous liquor, 40-50 parts of fish oil, 0.3-0.5 part of edible salt, and 2-3 parts of allium fistulosum powder. According to the present invention, the rapid trionyx sinensis fattening feed is rich in animal proteins, vegetable proteins, starch, fat, crude fibers, vitamins and minerals, has characteristics of complete nutrition, delicious taste, reliable raw material matching and balanced nutrition, and can make trionyx sinensis have characteristics of good appetite, fast growth, more weight increasing, rapid fattening, less disease, good trionyx sinensis meat quality and good taste.