Preparation method of silicate aqueous solution

The invention relates to a preparation method of a silicate aqueous solution, and belongs to the technical field of silicate preparation. An active silicic acid-containing solution obtained by reaction of fluosilicic acid and calcium carbonate is used as a silicon source, and an aqueous solution of sodium hydroxide, potassium hydroxide or lithium hydroxide is used as an alkali source; and reacting the two solutions at room temperature and normal pressure to obtain a corresponding silicate dilute solution product, and concentrating the dilute solution in a membrane filtration manner to obtain a product meeting market requirements. The production process is simple, the energy consumption is low, and the obtained product is clear and transparent; according to the silicate preparation method provided by the invention, the product is low in energy consumption and does not need to be heated and pressurized, and the prepared water glass product is high in modulus which can be controlled between 1 and 12 as required.