Flame-retardant slurry

The invention discloses flame-retardant slurry, which belongs to slurry formed through mixing inorganic aggregate and inorganic emulsion, wherein the inorganic aggregate and the inorganic emulsion respectively comprise the following ingredients in percentage by weight: 5 percent of mineral wool, 34 percent of expanded perlite, 16 percent of hydroxyethyl cellulose with the concentration being 2 percent, 6 percent of rock wool, 5 percent of asbestos plaster, 2 percent of zinc oxide, 3 percent of condensed aluminum phosphate, 20 percent of modified potassium silicate, 9 percent of modified silica sol and 16 percent of hydroxyethyl cellulose with a concentration of 2%. A preparation method comprises the following steps that: firstly, two kinds of inorganic emulsion: the modified potassium silicate and the modified silica sol are respectively added into a container and are uniformly stirred, then, each kind of aggregates and emulsion are respectively added into the container to be mixed into slurry through being s