Antibacterial polyester short fiber is a permanent functional fiber made by fusing antibacterial materials into the spinning melt and spinning. Compared with the antibacterial finishing method, it has the advantages of high antibacterial rate, long-lasting antibacterial effect, safety and harmlessness to human body, and wide range of use. Tested by the authority, it has significant antibacterial effect on Staphylococcus aureus (ATCC6538), Pneumonia (ATCC4352), Candida albicans (ATCC10231).