The invention discloses a skimming tool for blast-furnace casting, and belongs to the technical field of refractory materials for blast furnace. The skimming tool consists of a refractory aggregate and a binder. The refractory aggregate comprises waste high-aluminum brick, mullite, quartz sand, chromite, bentonite, kaolin, coke, fly ash, silicon carbide, ceramic waste, magnesium oxide, lanthanum oxide, titanium boride, thorium oxide, Suzhou soil, clay, aluminium powder and zirconia; and the binder is composed of asphalt, silicone resin, melamine formaldehyde resin, butadiene nitrile rubber, 2-imidazolidinone, starch, sodium triacetoxyborohydride, salt, Cetyl trimethyl ammonium chloride and chloroprene rubber. The skimming tool provided by the invention through specific component ratio greatly prolongs the service life of the skimming tool to 60 days without repair, does not require supplementary material in the use process, greatly reduces the stokehold labor intensity, and guarantees the stable, secure and smooth conditions of the high furnace.