The invention provides a novel method for preparing a skin-protective composite protein facial mask. The method adopts commercial defatted rice protein and collagen as raw materials, and comprises the following steps: preparing a small-molecular rice protein peptide solution; preparing a small-molecular collagen peptide solution; preparing a composite protein solution; and preparing the composite protein facial mask. According to the produced composite protein facial mask, the effective component rice protein-collagen composite protein is bonded to cellulose non-woven fabric facial mask paper through an ether bond of glycidyl ether, the bonding is firm and cannot easily fall, the facial mask paper can be repeatedly used to reduce cost; the facial mask is mild and non-irritative to skin by combining the advantages of non allergy of rice protein and strong skin-protection of collagen; furthermore, the facial mask is weak in adsorption capacity to nutrition and functional factors, so that nutrition and functional factors can easily infiltrate into skin and supply nutrition to skin in time. A certain amount of wetting agent, antioxidant, emulsifier, essence and other nutritional factors are added into the prepared composite protein facial mask, and the facial masks are filled into bags to prepare different types of facial mask finished products. The facial mask is wide in application.