A firming and whitening mask mainly comprises hyaluronic acid, mycose, glycerin, an aloe extract liquid, allantoin, rose water, dipotassium glycyrrhizinate, deionized water, xanthan gum, a moss extract product, methylisothiazolinone, thioctic acid, azone, phenylethyl resorcinol and an alga extract product. A preparation method of the mask comprises the following steps: adding hyaluronic acid and xanthan gum into deionized water, carrying out stirring heating, and adding mycose, allantoin and dipotassium glycyrrhizinate; 2, cooling, adding glycerin, and adding the aloe extract liquid, rose water, thioctic acid, azone, phenylethyl resorcinol and the alga extract product; 3, cooling, and adding the moss extract product and methylisothiazolinone; 4, sampling, discharging, and putting a material obtained after discharging in a standing room; 5, filing a bag with a mask plaster; 6, loading a material obtained in step 4 into the mask plaster bag; and 7, sealing the mask bag, and packaging the mask bag in a box. The firming and whitening mask moistens dry skins, makes skins fine, soft and smooth, deeply diffuses into skins, combines with deep water, maintains skins moist and glossy, and has allergy preventing, skin firming and whitening effects.