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This invention relates to the field of dialysis paper technology, and particularly to a fiber pretreatment method for dialysis paper and dialysis paper itself. The fiber pretreatment method for dialysis paper includes the following steps: Step 1, weighing softwood fibers, broadwood fibers, and regenerated fibers and placing them in deionized water, stirring thoroughly to obtain a mixture; Step 2, adding an initiator to the mixture, heating to 35-45°C, and mixing evenly; Step 3, adding modified nanoparticles to the mixture from Step 2, and stirring continuously for 4-6 hours; Step 4, after the reaction is complete, washing, filtering, and drying to obtain the pretreated fibers for dialysis paper. The fiber pretreatment method for dialysis paper proposed in this invention can uniformly attach nanoparticles to the fiber surface. When the nanoparticles are compressed by the fibers, they can aggregate towards the "gaps" between the fibers, preventing excessively large gaps between the fibers and avoiding the passage of bacteria or dust through the dialysis paper.