A sealing device for the furnace mouth of a high-temperature oriented silicon steel electromagnetic induction heating furnace belongs to the technical field of industrial furnaces. The sealing device comprises a furnace bed, a sealing cutter, a furnace bottom framework, a fiber sealing groove, a fiber blanket, a rubber plate, a rubber hose sealing groove, a rubber hose and a nitrogen pipe. The sealing device provided by the utility model has the advantages that the structure is simple and novel, the sealing is reliable, the mounting and the maintenance are convenient, and during the blank heating process, the problems of incapability in controlling atmosphere inside the furnace, uneven blank heating, serious oxidized burning loss, large edge fracture during the rolling process, low operation rate of the heating furnace and unstable product quality, which are caused by the facts that N2 inside the furnace escapes or cold air outside the furnace enters into the furnace, can be prevented. The sealing device has obvious economic benefits and social benefits, and serves as special equipment for sealing the furnace mouth of the high-temperature oriented silicon steel electromagnetic induction heating furnace.