The invention relates to a ventilation device of an optical fiber curing furnace. The curing furnace comprises a furnace body; a furnace core is arranged at the center of the furnace body; the upper part of the furnace core is communicated with a furnace body upper opening of the furnace body, and the lower part of the furnace core is communicated with a furnace body lower opening of the furnace body; the ventilation device comprises a gas inlet mechanism and an exhausting mechanism, and is characterized in that the gas inlet mechanism comprises a gas inlet cover, a gas inlet spiral blade disc and a gas inlet hood; the gas inlet cover is fixed at the bottom of the furnace body; the gas inlet spiral blade disc is arranged in the gas inlet cover; the gas inlet hood is fixed at the bottom of the gas inlet cover; the exhausting mechanism comprises an exhausting cover, an exhausting spiral blade disc and an exhausting hood; the exhausting cover is fixed at the top of the furnace body; the exhausting spiral blade disc is arranged in the exhausting cover; the exhausting hood is fixed with the exhausting cover at a corresponding position above the exhausting spiral blade disc. By adopting the ventilation device of the optical fiber curing furnace, optical fibers do not shake; curing defects of a coating layer and optical fiber loss are avoided; ventilation keeps smooth; flows of inlet gas and outlet gas are stable; mixed gas is prevented from escaping out of the furnace body from inside; nitrogen gas and compressed air are saved and the curing quality of the coating layer is guaranteed.