The invention discloses a soil material with high unconfined compressive strength. The soil material comprises composite soil and water. The weight of the water accounts for 8.2%-18.8% of the composite soil. The composite soil comprises, by mass, 1-6% of nanometer aluminum oxide and 94-99% of dry soil. Due to the fact that the dry soil is mixed with a certain mass of nanometer aluminum oxide, the engineering property of the soil is effectively improved, and the unconfined compressive strength of the soil material is effectively improved.