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This invention relates to the field of fabric technology, specifically to a breathable antibacterial fabric and its preparation process, and sportswear made from this fabric. The preparation process of the breathable antibacterial fabric includes: preparation of a composite antibacterial agent, preparation of multifunctional polyester fibers, amination modification of phenolic lignin, modification treatment of polyacrylonitrile, and preparation of the breathable antibacterial fabric. The breathable antibacterial fabric of this invention consists of inner, middle, and outer layers: the inner layer is a blend of modal and other materials, which is skin-friendly, moisture-wicking, and antibacterial; the middle layer is a polyurethane film layer; the outer layer contains polyacrylonitrile composite fibers, which are antibacterial, crisp, and breathable. A composite antibacterial agent made of chitosan, cysteine, and copper nitrate imparts dual antibacterial properties to the fabric, reducing bacterial resistance. Ethylene treatment enhances the bonding of components, improving wash resistance and antistatic properties; the co-spinning of amination-modified phenolic lignin and polyacrylonitrile increases fiber strength, breathability, and UV resistance. This fabric is suitable for sportswear.