The invention relates to the field of daily chemicals, in particular to a paste whitening moisturizing facial mask and a preparation method thereof. The preparation method comprises the steps: addingwater, glycerin and propylene glycol to hydroxyethyl cellulose, vital gluten, aloe vera, carbomer and pearl powder, performing three-roller grinding so as to form base paste, and further dispersing hydrolyzed avenin, Cladosiphon okamuranus extract, panthenol, triethanolamine, methylparaben, PEG40 hydrogenated castor oil, lactobacillus ferment extract and water-soluble modified azone in the base paste so as to form the paste facial mask, wherein a transparent film can be formed quickly by the effective substances in the paste facial mask after the paste facial mask is smeared, cutin of the skinis softened by the effective substances under the promotion action of penetration, and the skin is fully whitened, moisturized and nourished. In particular, water, glycerin and propylene glycol are added to hydroxyethyl cellulose, vital gluten, aloe vera and carbomer, three-roller grinding is performed so as to form the base paste, the film which is formed through smearing has elasticity, and fits the skin comfortably, no feelings of skin tightness are caused, and the facial mask can be peeled off easily after use.