The utility model provides a sealing roller for a galvanized continuous annealing furnace. The sealing roller consists of roller shafts and a roller body, wherein stepped roller shafts are welded at the two ends of a cylindrical roller body; a roller shaft at one end of the roller body is provided with an air-bleed hole; and heat insulation cotton is filled in a roller body cylinder. The heat insulation cotton is filled in the roller body and the air-bleed hole is formed, so that a structure is simplified and a large amount of cooling water is saved; moreover, a cooling water system is eliminated, so that the possibility of the generation of condensed water or water seepage is eliminated, an iron leakage phenomenon on a galvanized plate surface is avoided, hundreds of tons of wastes which are produced by iron leakage and are worth about a million yuan can be reduced every year, and the quality objection rate of an electrical appliance plate can be reduced by 0.1 percent.