Clay waterproof rock stratum similar material and preparation method thereof

The invention discloses an argillaceous waterproof rock stratum similar material and a preparation method thereof, the argillaceous waterproof rock stratum similar material comprises a mineral component material, a strength adjusting material, a permeability adjusting and cementing material and water, the mineral component material comprises 10-90 parts of quartz sand, 5-70 parts of kaolinite powder, 5-50 parts of montmorillonite powder, 0.1-30 parts of illite powder, 0.1-30 parts of plagioclase powder, 0.1-20 parts of potassium feldspar powder and 0.1-20 parts of dolomite powder; the strength adjusting material is 0.01-0.05 part by weight of graphene, the permeability adjusting and cementing material is 5-15 parts by weight of polyvinyl alcohol, and the water is deionized water and accounts for 15-25% of the total weight of the materials; all the components are counted in parts by mass. The similar material achieves similar external strength, permeability, stress-strain and water-rock action characteristics