The invention discloses a covering comprehensive material as well as a preparation method and application thereof, and relates to the field of aluminum alloy modifiers. The covering comprehensive material is prepared from the following raw materials of, in percentage by weight, 3%-9% of aluminum chloride, 0.5%-0.8% of manganese acetate, 2%-9% of sodium nitrate, 0.11%-0.18% of zinc fluoride, 8%-12%of potassium chloride, 12%-16% of sodium chloride, 6%-10% of sodium fluoride, 9%-18% of composite powder and the balance sodium fluoroaluminate; when the covering comprehensive material is used as the modifier, the modification refinement elements are matched with each other, so that the modification effect is excellent; when the modifier is used as a covering agent, so that the melt can be prevented from being absorbed and oxidized, the heat preservation effect is good, the exhaust emission is promoted, the potash feldspar clay powder in the raw materials can be used as a modifier carrier toremove gas and remove slag, the smelting step is simplified, the smelting efficiency is improved, and the alloy hardness can be remarkably improved by the rich aluminum oxide and silicon oxide. Whenthe aluminum alloy is smelted, the strength, the plasticity and the hardness of an aluminum alloy casting can be remarkably improved by using the covering comprehensive material.