The invention provides a fattening compound pig feed and a preparation method thereof. The feed consists of the following raw materials: corn, fine bran, high-protein soybean meal, corn germ meal, DDGS, rice bran meal, fine stone powder, soybean oil, calcium hydrogen phosphate, lysine, salt, Chinese herbal medicines, organic trace elements, baking soda, choline chloride, organic iron, threonine, amulti-vitamin premix for fattening pigs, a flavor enhancer, aureomycin, bacitracin zinc, vitamin C, phytase, complex enzymes, aspartame and vitamin E. The feed disclosed by the invention can enable the fattening pigs to grow faster, to have a better body type, to come into market soon, and to accelerate the fund flow of pig farms.