Inorganic aluminium salt waterproofing agent (liquid) is a mortar waterproofing additive that provides waterproofing, water reduction, anti-cracking, anti-stretching, anti-bending, early strength, anti-seepage, anti-leakage, moisture, acid and alkali resistance, etc. It is specifically used for the construction of the structural surface layer of steel to create a solid and dense water-repellent material. It fills and blocks the capillary pore space and water channels formed during the hardening process of concrete and mortar, exhibiting strong hydrophobicity and moisture repulsion. This results in excellent waterproof performance for concrete structures and cement products.