The invention relates to a pig fattening feed and belongs to the technical field of animal feeds. The pig fattening feed mainly solves the technical problems of overmuch fatty pork, high cost and low income which are caused by adopting concentrated feed to fast fatten pigs when the pigs are fattened before being taken to markets in the conventional feedlots. The pig fattening feed is prepared by mixing the following raw materials in a certain proportion: corn flour, soybean meal, bran, rock flour, calcium hydroxide, salt and premix, wherein the premix consists of vitamin A, vitamin B1, vitamin B2, vitamin B6, vitamin B12, vitamin D3, vitamin E, vitamin K3, biotin, niacin, calcium pantothenate, folic acid, choline chloride, ferrous sulfate, copper sulfate, manganese sulfate, zinc sulfate, potassium iodide and sodium selenite. The pig fattening feed has the advantages of high feed utilization efficiency, low cost and high income.