The invention relates to a fiber drying device. The device comprises a rack, the rack is provided with a conveying device and a drying box, fibers are conveyed to the drying box by the conveying device, and the drying box is used for drying the fibers. The device has the advantages that the structure is stable, the operation is stable, automatic drying on the fibers can be achieved, the drying effect is good, the drying efficiency is high, the whole sections of the fibers can be dried, and the current using demands are met.