The invention discloses a whitening and moisturizing facial mask and a preparation method thereof, comprising water, moisturizing agent, thickener, preservative, solubilizer, nicotinamide, lanolin, glycerin polymethacrylate, knotweed extract, chamomile extract Extract, tea leaf extract, licorice root extract, scutellaria baicalensis extract, rosemary extract, tocopherol, panthenol. After the mask is used, the present invention can still absorb water externally and lock water internally, achieve long-term water-locking and deep moisturizing effects, reduce the risk of skin melanin formation due to lack of water, ensure whitening effect, and the whitening effect is more stable and long-lasting. In addition, the present invention whitens the skin by inhibiting melanin production, inhibiting the activity of pigment cells, and enhancing the antioxidant capacity of the skin. effect.