The invention discloses postoperative repairing mask and a preparation method thereof. The postoperative repairing mask comprises the following components in percentage by mass: 12 to 24 percent of konjac glucomannan, 15 to 19 percent of water-soluble chitosan, 15 to 23 percent of panax notoginseng polysaccharide, 9 to 14 percent of oat beta-glucan, 3 to 10 percent of algal polysaccharide, 3 to 6percent of tea polysaccharide and 13 to 38 percent of hyaluronic acid. The postoperative repairing mask provided by the invention utilizes the excellent gelling property of the konjac glucomannan andcombines with the effects of moisturizing and preserving moisture, diminishing inflammation and swelling, promoting wound healing, repairing injured skin and the like, of various biological polysaccharides, so that the skin problem after facial plastic surgery can be repaired effectively; furthermore, the postoperative repairing mask can be used under the condition of not adding any nutritional liquid components, is non-irritant to skin, does not generate burden and is convenient to use.