The invention discloses a base material of an inorganic coating and application of the base material. The base material is a mixture of liquid silica sol and calcium carbonate, wherein a mass ratio of the liquid silica sol to the calcium carbonate is 1:(3-10) based on solid content. The inorganic coating can be obtained by adding auxiliary materials which account for less than 20 percent of the total mass of the inorganic coating on the basis of the base material. The inorganic coating has the characteristics of high ageing resistance, high weather resistance, high chemical bonding force with a cement base layer, peeling avoidance, heat resistance, fire resistance, no toxicity, environment friendliness and energy conservation, does not contain strong alkaline ions such as potassium ion and sodium ion, has the pH value of less than 10 and is high in compatibility with pigments, a saltpetering phenomenon is avoided, and inorganic coatings of various colors can be manufactured. The base material can be used for preparing rigid waterproof materials, colored facing mortar, artificial stone materials and art paint.