Abstract: The invention relates to the field of biomedicine and particularly to a hydrophobically modified antimicrobial peptide and a use thereof. The technical problem to be solved by the invention is to provide a hydrophobically modified antimicrobial peptide, the hydrophobic modification is to couple a hydrophobic fragment at the nitrogen terminal of the antimicrobial peptide. The invention further provides a micelle prepared from the hydrophobically modified antimicrobial peptide, and use of the hydrophobically modified antimicrobial peptide and the micelle in preparing antimicrobial drugs, nucleic acid transporter, immune adjuvant and the like. Due to small molecular weight, the antimicrobial peptide of the invention can be conveniently synthesized by Fmoc solid phase polypeptide, and coupled to a hydrophobic fragment by the chemical synthesis method in a simple and feasible way.