Antibacterial peptide of heterometrus spinifer and application of antibacterial peptide

The invention provides a Peptocin antibacterial peptide separated from heterometrus spinifer and obtained through a chemical synthesis method. The antibacterial peptide has a remarkable antibacterial effect on clinically-separated multi-drug resistant acinetobacter baumannii, and can be used for efficiently inhibiting the growth of the drug resistant acinetobacter baumannii; and meanwhile, human red blood cell toxicity tests also show that the antibacterial peptide is small in toxicity and can be applied to the preparation of drugs for treating or preventing diseases caused by the drug resistant acinetobacter baumannii and particularly to the preparation of drugs for treating serious infectious diseases such as ventilator-associated pneumonia, septicemia, meningitis, otitis media, skin soft-tissue infection, urinary system infection, central nervous system infection and the like caused by the drug resistant acinetobacter baumannii. The antibacterial peptide provided by the invention is remarkable in inhibiting effect on gram bacteria, unique in antibacterial mechanism and low in toxicity, and can also be applied to the preparation of drugs for treating or preventing diseases caused by micrococcus luteus, salmonella and other gram bacteria.