The invention discloses an inorganic nanocementing agent, which is characterized by corrosion prevention, fire- proof, wearing resistant, acid-resistant and alkali reisistant. It takes silicasol and potassium metasilicate as raw material, and produced by adding a little amount of organic raw material or inorganic raw material, and the comprised raw material and their proportion by weight are as follows: nanocolloidal silica 10 -15, potassium metasilicate 20- 30, polyvinyl alcohol 1- 5, nano titanium dioxide 3- 6, titanium dioxide titanium dioxide 7- 12, calcining porcelain clay 2- 6, porcelain clay 2- 6, silicon zirconite powder 10- 14, barium sulfate powder and water 8- 15; or as that: nanocolloidal silica 10 -15, potassium metasilicate 20- 30, polyvinyl alcohol 1- 5, mica titanium 20- 30, nano zinc oxide 7- 12, high-alumina powder 2- 6, charring silicon 10- 18, barite powder 8- 16, and clean water 8- 15. The product will not deform at 1200 Deg. C, it can form permeating high- rigidity compact coating on metal surface, and there is no permission, cracking and separation when the gelatin is heated to 300- 500 Deg. C for several hours and for more than fives times of shock cooling and heating.