The invention provides anti-cracking concrete and a preparation method thereof. The anti-cracking concrete is prepared from coarse aggregate, fine aggregate, cement, fly ash, a water reducing agent and water, and is characterized in that the cement and the fly ash serve as a total gel material, the using amount of the needed cement for preparing 1 m<3> concrete is (228-336) kg, the using amount of the fly ash is (76-168) kg, the using amount of the water is (135-155) kg, the total using amount of the coarse aggregate and the fine aggregate is (1800-1950) kg, the sand rate is (44-46)%, and the weight of the water reducing agent is (0.9-1.0)% of the weight of the total gel material. According to the technical scheme, the advantages of the various components and the preparation method are comprehensively utilized, the hydration heat of the cement of the concrete is reduced, and better anti-cracking performance can be shown in an environment with large morning and night temperature difference.