The invention discloses a mask prepared from a functional edible mushroom-sourced dressing and a preparation method, and belongs to the technical field of skin-care products for medical cosmetology. The mask comprises the following components in parts by weight: 10-30 parts of the functional edible mushroom-sourced dressing, 5 parts of a poria cocos powder, 2 parts of vitamin E, 2 parts of glycerol, 2 parts of lecithin, 0.5 part of butanediol, 0.5 part of allantoin and 15 parts of purified water. The invention further discloses the preparation method of the mask prepared from the functional edible mushroom-sourced dressing. The invention develops the mask with the function of promoting repair and regeneration of damaged epidermis; wastes can be turned into treasures; the mask can be applied to follow-up care in the medical cosmetology; the added value of factory production of edible mushrooms is further increased and the profit of an enterprise is increased while a gap in the market isfilled, so that the mask has a very high economic value and a very good social effect.