The invention relates to the technical field of metallurgy, and specifically relates to a sagger demolding backing material formula and a using method thereof. The sagger demolding backing material formula comprises the following components in parts by weight: 50 to 70 parts of silica sand, 30 to 50 parts of emery powder, 60 to 90 parts of a carbonaceous material, 15 to 30 parts of mullite, 20 to50 parts of bentonite, 10 to 40 parts of montmorillonite, 5 to 35 parts of fluorite and 25 to 70 parts of limestone. After a sagger demolding backing material is paved at the bottom of a sagger, alloycan be prevented from being adhered with the sagger in the smelting process effectively, and the problems that an alloy taking process wastes time and labor in the prior art and the sagger is damagedeasily in the beating process are solved.