Disclosed are an environmentally-friendly anti-cracking, anti-corrosive and waterproof material and a preparation method therefor, which may solve the following problems of the existing waterproof and anti-corrosive materials: a single function, a poor property, a high cost and a short service life. The waterproof material in the present invention consists of the following components in weight parts: 5-15 parts of synthetic polyester resin, 3-6 parts of penetrant, 1-3 parts of cellulose fiber, 0.1-0.3 parts of cellulose ether, 75-85 parts of solvent. A preparation method of the above waterproof material is also provided. The formulation used in the present invention can have the effects of efficiently protecting indoors and outside, and be used for penetration resistant, waterproof, moisture proof, mildew proof, anti-corrosive, acid and alkali resistant, oil leaking resistant, corrosion resistant, freezing and thawing resistant, anti-cracking, weather and aging resistant, and fouling resistant penetration-type waterproof, anti-corrosive indoors and outside corrosion resistant engineering.