The invention discloses an inorganic grouting material capable of stopping clear water and reinforcing the structure and its preparation method and application. The inorganic grouting material comprises component A: 3-4 parts of potassium silicate solution, sodium silicate solution 2 to 3 parts, 1 to 1.5 parts of dispersant, 0.1 to 0.2 parts of defoamer, 10 to 13 parts of water; component B: 0.1 to 0.2 parts of water reducing agent, 20 to 25 parts of superfine cement, 8 to 2 parts of mineral powder 9 parts, silica fume 0.5-0.7 parts, fly ash 2-3 parts, flocculant 0.5-0.6 parts, expansion agent 0.5-0.6 parts, retarder 0-1 part, water 10-13 parts. The invention is an inorganic grouting material based on cement-based materials, which can achieve the effect of solidification in a very short time, can adjust the curing time, solidify and stop water in a short period of time, will not be washed away by water flow, and can be cured after hardening. It plays the role of strengthening the structure, and the hardened body does not shrink, and has the same life as the concrete structure, which can effectively promote the development of the industry of building grouting, waterproof and plugging.