The invention discloses a regenerating and repairing mask liquid by applying a snail mucus extract and a preparation method thereof. The mask liquid comprises a phase A as a functional ingredient, a phase B as a water phase ingredient, a phase C i.e., triethanolamin, and a phase D as an auxiliary agent ingredient. The preparation method comprises the following steps: heating up the phase B to 75-95 DEG C, preserving the heat at 70-90 DEG C, stirring to dissolve fully, adding the phase A at 50-70 DEG C, preserving the heat and fully dissolving, homogenizing for 2-3min, stirring uniformly, adding the phase C to neutralize at 40-60 DEG C, stirring uniformly, adding the phase E at 30-50 DEG C, and stirring uniformly. The make liquid disclosed herein is safe and effective, has fine molecules, can be rapidly absorbed by skin, is suitable for various types of skins, is helpful for improving sensitive skins, has obvious effect on preventing and improving scars, can mildly and effectively inhibit whelk, acne, and dark, provides skins with natural elastic force and collagen, and can effectively whiten, moisten, make spots fade away, prevent light aging, and delay skin aging.