The round granular heat preservation agent for molten steel is a kind of round granular heat preservation agent used in ladle and based on carbonized rice husk. It is filled with fly ash and expanded graphite, and each component is prepared in a certain proportion. The round granule formed by professional production mode is packaged as finished product. It is reasonable in shape, light in weight, non-sticking, non-polluting environment, good spreading and good in heat preservation effect. A new round granular insulating agent for molten steel with low cost. Shougang, Angang and other steelmaking plants are very satisfied with our products.