The present invention provides a nano silica gel comprising: a silicon, which is an inorganic clay in an amount of 0.9 to 4.7%； an exfoliation agent, a polysaccharide which is composed of a plurality of glucosamines (deacetylated units) and a plurality of N-acetylglucosamines, and is combined by a β-(1-4) glycosidic bond, the content of the exfoliation agent is 0.6~3.4%； the acid is an acidic compound, the content is 0.3-2%； and water, havinga chemical formula of H2O, the content is 92-98%； wherein the particle size of the nano silica gel is less than 500 nm.本發明提供一種奈米矽凝膠，其包含：一矽，其係一無機黏土，含量為0.9~4.7%；一脫層劑，其係一多醣類，由複數個氨基葡萄糖（脫乙醯單位）和複數個N-乙醯葡糖胺，並透過β-（1-4）糖苷鍵組合而成，前述脫層劑之含量為0.6~3.4%；一酸，其係一酸性化合物，其含量0.3~2%；及一水，其化學式為H2O，前含量為92~98%；其中，前述奈米矽凝膠之粒徑小於500nm。
