The invention provides a dietary formula containing chitosan oligosaccharide and cordyceps militaris powder for liver cancer patients. The dietary formula comprises the following components in parts by weight: 35-45 parts of marine fish collagen peptide, 2-3 parts of chitosan oligosaccharide, 2-3 parts of cordyceps militaris, 1-3 parts of haematococcus pluvialis, 9-11 parts of sea buokthom powder, 19-20 parts of isomaltooligosacharide, 1-3 parts of selenium enriched rice meal, 19-21 parts of polydextrose, 0.5-1.5 parts of sucralose, 0.5-1.5 parts of edible essence and 0.5-1.5 parts of citric acid. The invention provides chitosan oligosaccharide and cordyceps militaris powder. Due to scientific combination, the effects of all the components are developed thoroughly to achieve excellent treatment and health effects.