Solid defoaming composition and preparation method thereof

The invention relates to a solid defoaming composition and a preparation method thereof, the solid defoaming composition comprises the following raw materials by mass: 20-70% of an inorganic carrier, 20-70% of a defoaming active matter, 1-5% of an emulsifier, 1-10% of a water-retaining agent, and 5-30% of water; the solid defoaming composition comprises an intermediate and a hydrophilic layer coating the intermediate, the intermediate is formed by adsorbing an emulsifying defoaming agent by an inorganic carrier, and the emulsifying defoaming agent is obtained by mixing an emulsifier and a defoaming active matter; the hydrophilic layer is obtained by mixing a water-retaining agent and water. According to the solid defoaming composition, the intermediate is coated and physically isolated through the water-retaining agent and water, a hydrophilic layer is formed, the flame-retardant effect is good, the release speed of the defoaming agent in a foaming system can be increased, and the obtained solid defoaming com