The invention relates to a snake gall facial mask and a preparation method thereof. The effective constituents of the snake gall facial mask are prepared from the following raw materials of, by weight, 80-90 parts of deionized water, 6-12 parts of butanediol, 2-8 parts of glycerinum, 6-16 parts of propylene glycol, 0.02-0.06 part of sodium hyaluronate, 0.1-0.7 part of allantoin, 0.4-1 part of polyglycerylmetharylate and propylene glycol, 4-12 parts of rose hydrosol, 0.1-0.6 part of camellia oil, 0.2-1 part of a snake gall extracting solution, 0.8-2.2 parts of aloe gel and 0.2-1 part of PE9010. The snake gall facial mask is capable of repairing damaged skin rapidly, increasing the water content of the skin, moistening the skin, improving dim complexion, enhancing the skin elasticity, compacting the skin and achieving whitening and freckle-removing, and has the characteristics of resisting and preventing wrinkles, preventing acne, removing scars, achieving sun protection and after-sun repair and the like.