The invention discloses an inorganic salt waterproof leakage stopping and reinforcing grouting material and a preparation method thereof. The grouting material is composed of two parts of a material Aand a material B which are separately packaged, and the material A and the material B are mixed when used. The material A is a liquid material and comprises, by weight, 45-70 parts of water, 10-40 parts of acrylic acid, 10-30 parts of emulsion and 5-10 parts of triethanolamine. The material B is a powder material and comprises, by weight, 50-70 parts of magnesium oxide, 10-30 parts of micro silicon powder, 10-30 parts of acrylic resin, 2-5 parts of methylene diacrylamide and 2-5 parts of ammonium persulfate. The grouting material of the invention has the advantages of high elasticity, high strength, strong water absorption, large water fixing amount, good consolidation force, good durability, wide application range, wide adaptability and the like, and is a functional composite grouting material with a waterproof leakage stopping function and a reinforcing performance.