The present invention relates to a method for manufacturing a fiber processing agent using a collagen peptide extracted from a leather by-product, and more particularly, to a collagen peptide extracted by hydrolysis from a leather by-product to remove chromium and salt, a grafting agent treatment, and redox with an acrylic monomer By sequentially carrying out the polymerization reaction, thermal stability, flame retardancy, dispersibility and moisture retention can be remarkably improved, and manufacturing cost can be significantly reduced by recycling collagen peptides extracted from leather by-products, and human body stability is excellent. In addition, the processing agent for fibers of the present invention contains a large amount of hydrophilic amino acids, so there is no skin trouble and excellent moisturizing properties, and yellowing does not occur during processing, so it has excellent processability and stability.
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