High-quality nano-silver inorganic antibacterial agents are applied to series of anti-bacterial/mildewproof masterbatch with all kinds of plastic raw materials as the carrier. By the means of the slow release of silver irons, a durable, efficient and safe anti-bacterial function is obtained. Our anti-bacterial/mildewproof masterbatch has a significant inhibiting and killing effect to Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Candida albicans etc; and inhibit to produce odors in harsh conditions