Cementing material composition, cementing material as well as preparation method and application of cementing material

The present invention relates to the technical field of building materials, and discloses a cementing material composition, the composition comprises first fly ash, second fly ash, water and Portland cement, the first fly ash and the second fly ash respectively contain CaO, and the CaO content in the first fly ash is less than the CaO content in the second fly ash. According to the cementing material composition, the cementing material prepared by compounding the fly ash has good fluidity and compressive strength, the bleeding rate is small, and the phenomenon that fine particles flow out along with bleeding to pollute the underground environment is avoided; the use amount of fly ash in the cementing material is large, the material cost can be effectively reduced, the cementing material is used in a mine backfill material, the problem of fly ash accumulation can be solved, pollution of fly ash accumulation to atmosphere, water, ecology and other environments is reduced, and meanwhile, the daily management and