The invention discloses a chitosan oligosaccharide capsule; chitosan oligosaccharide with 2000-10000 of molecular weight, radix salviae miltiorrhizae extract, pueraria root extract, obtuseleaf senna seed extract and schisandra extract are used as main materials; starch and magnesium stearate are taken as auxiliary raw materials; the weight components of the formula of the chitosan oligosaccharide capsule include the chitosan oligosaccharide, the radix salviae miltiorrhizae extract, the pueraria root extract, obtuseleaf senna seed extract, schisandra extract, the starch and the magnesium stearate; the production process of the capsule is that: sieving, weighting, mixing, capsule filling, polishing, screening, inside and outside package, warehouse-in inspection are carried out to prepare the health-care product. The chitosan oligosaccharide capsule has the advantages that the main composition of the capsule comprises the chitosan oligosaccharide, general flavone and total anthraquinone; the capsule is taken orally two times one day, 3 granules each time, and the capsule has auxiliary protection function to the chemical liver damage.