The invention relates to a magnesium-calcium dry material, which comprises the following raw materials in parts by weight: 35-50 parts of active magnesium oxide, 25-35 parts of waste magnesium-calciumbrick aggregate, 3-12 parts of granular magnesium oxide, 10-15 parts of a compound bonding agent, 5-10 parts of an additive, 3-5 parts of zirconate and 0.3-0.5 parts of sol. The product and raw materials in the invention are safe and non-toxic, have no adverse effect on users and the environment, has high density, high heat conductivity, excellent thermal stability, thermal shock resistance, corrosion resistance, normal temperature mechanical property and high temperature mechanical property, and has an extremely wide application prospect in the field of metallurgical steel-making; and as modified resin is used as a bonding agent, no choking smoke or toxic and harmful gas is generated in a decomposition process. The magnesium-calcium dry material provided by the invention has the advantages of energy conservation, emission reduction, environmental protection, low cost and the like; meanwhile, the product solves the problems of poor normal temperature strength and poor high-temperatureslag resistance of dry materials.