The invention aims to provide a method for reducing
optical fiber loss, and relates to the
optical fiber manufacturing field. The method for reducing the
optical fiber loss comprises the step of cooling a naked optical
fiber obtained after preformed bar drawing by adopting a cooling
system, wherein the cooling
system comprises a plurality of cooling cylinders, each cooling cylinder is internally provided with a first pipeline for conveying cooling gas and for the optical
fiber to move, cooling water is introduced between the cooling cylinders and the first pipelines, each cooling cylinder is internally provided with a second pipeline in
interference fit with the first pipeline, and the inner diameters of the plurality of the second pipelines separated from top to bottom are increased gradually. The method for reducing the optical
fiber loss is simple, ingenious, and low in cost, and can significantly reduce the optical fiber loss.