Anti-erosion and water-holding composite material improved sandy soil and preparation method thereof

The invention discloses anti-erosion and water-holding composite material improved sandy soil and a preparation method thereof. The method comprises the steps that ultrapure water is added into dried sandy soil to be mixed and stirred, so that the ultrapure water is diffused to obtain wet soil; adding fibers into the wet soil, and stirring, so that the fibers are dispersed in the wet soil to obtain fiber mixed soil; the mass of the fibers is 0.4%-0.6% of the mass of the sandy soil; the preparation method comprises the following steps: mixing polyacrylamide with ultrapure water, so that the polyacrylamide is fully dissolved to obtain a polyacrylamide solution; wherein the mass of the polyacrylamide is 0.8%-1.2% of the mass of the sandy soil; mixing the polyacrylamide solution with the fiber mixed soil to obtain a composite mixture; and curing the composite mixture in a constant-temperature and constant-humidity environment to obtain the composite material improved sandy soil. The problem that in the prior art,