The utility model discloses an annealing furnace inlet sealing device, which can lower the gas pressure and concentration of hydrogen at the inlet of an annealing furnace and improve sealing effect, and comprises a sealing roller component and a sealing turning plate component arranged in front of the furnace throat of the annealing furnace, as well as a sealing air knife component arranged between the sealing roller component and the sealing turning plate component, and a sealing curtain component at the furnace throat of the annealing furnace, via four times of block, three times of pressure reduction and two times of dilution of gas flowing from the inside of the annealing furnace to the outside of the annealing furnace, aiming to high content of hydrogen and high furnace pressure, the furnace is effectively sealed, and the phenomenon that the temperature of the working environment of equipment is over high, which is caused by burning of leaked hydrogen under the condition of high temperature, is avoided, as a result, safety hidden troubles are eliminated.