The invention relates to an efficient soil stabilizer. The efficient soil stabilizer comprises the following materials in parts by weight: 10-70 parts of coal ashes, 10-50 parts of cement, 10-30 parts of gypsum powder, 1-20 parts of aluminum sulfate and 1-5 parts of micro silicon powder. The soil stabilizer disclosed by the invention can be widely applied to clearing silt for river-lake bottom mud, paving a park walking road and a rural soil road, improving soil, and the like, has very strong soil stabilizing capacity, soil strengthening capacity, super-strong bad smell adsorbing capacity, excellent water-retaining property and water permeability, and is suitable for vegetation growing.