The invention discloses a concentrate feed containing chitosan oligosaccharide for weaning pig, and belongs to the technical field of pig feed. The feed comprises: calcium hydrophosphate, rock flour, table salt, lysine, choline chloride, organic iron, organic selenium, biological chromium, organic manganese, organic zinc, copper sulphate, ferrous sulphate, zinc sulfate, manganese sulfate, 1% of sodium selenite, 2% of calcium iodate, magnesium sulfate, phytase, vitamin A, vitamin D3, vitamin E, vitamin K3, vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinamide, calcium pantothenate, chitosan oligosaccharide powder, rice bran meal and bentonite. The chitosan oligosaccharide is added in the feed, and the feed can clear away the oxygen radical in the body, reduce the damage of cells caused by oxidation, protect the intestinal tract of animal, reduce the disease such as diarrhea, reduce the stress of pigs caused by weaning, improve the protein deposition of animal, improve the daily weight gain effectively, and create considerable economic benefit.