The invention discloses mushroom mooncake and a making method thereof. The mushroom mooncake is made with mushrooms, glutinous rice, salt, corn oil, maltol, lye, low-gluten flour, beaten egg, maltodextrin, dietary fiber powder, citric acid, and chitosan. The dietary fiber powder is made by enzymatically hydrolyzing soybean residue via a composite enzyme containing hypericin and taurine; syrup is made by boiling; skin is made; stuffing is made; shaping is performed after filling with the stuffing; baking is carried out before cooling and packaging to obtain the mushroom mooncake. The mushroom mooncake is a novel mooncake type having novel flavor, rich dietary fiber, low sugar and fat, and thin skin and bright stuffing, is oily and sweet, and has the advantages of high safety, good palatability, rich sensory experience, naturalness, zero additives, and greenness and health; the making method is simple to perform and has high production efficiency and good processing convenience, is environmentally friendly since waste is turned into wealth, allows industrial production to be easily implemented, can provide improved economic benefit for enterprises and good social benefit.