The invention relates to a facial mask congealed fat containing dendrobium officinale polysaccharide and a preparation method thereof. The facial mask congealed fat is prepared from dendrobium officinale polysaccharide silk protein, seaweed extract, aloe extract, chlorophyll, cucumis sativus extract, ganoderma lucidum extract, fiddlehead root extract, olive leaf extract, fennel seed extract, camellia oil extract, ginkgo leaf extract, poplar flower extract, beta-glucan, sodium cocoyl isethionate, shea butter, triglyceride, dendrobium officinale essence, disodium lauryl sulfosuccinate, sodium coco-sulfate, wheat starch, paraffin, titanium dioxide and a proper amount of distilled water according to a specified weight proportion. The facial mask congealed fat which has the advantages of high softness and toughness, and effects of moisturizing and protecting skin can be prepared under the condition of no adding of a modifier, the polysaccharide prepared from dendrobium officinale, so that the effects of moisturizing and protecting skin, and relieving the skin are achieved.