The present invention provides a fabricating method for natural cellulose fiber blended with nano silver.The fabricating method comprises following steps: Firstly, prepare nano silver colloidal sol by reduction titration for mixture of polyvinyl alcohol (PVA), silver nitrate (AgNO3) and sodium borohydride (NaBH4). Secondly, prepare mixing cellulose serum by blending agitation for mixture of wood pulp, N-methylmorpholine N-oxide (NMMO) and stabilizer. Thirdly, produce spinning dope by blending and dehydrating the nano silver colloidal sol and mixing cellulose serum. Fourthly, produce fibrous tow by Dry-Jet Wet Spinning method in association with coagulation, regeneration in coagulation bath, and water rinse. Finally, obtain final product of natural cellulose fiber blended with nano silver by post treatments of dry, oil and coil in proper order.