As traditional lithium-ion batteries near their theoretical limits, the advancement of lithium-metal batteries (LMBs) becomes crucial for achieving higher energy densities. However, uncontrolled ion transport and unstable solid electrolyte interface (SEI) layer are key factors inducing lithium dendrite growth, hindering the development of LMBs. Separator modification is an effective strategy to address the challenges of LMBs. To tackle the issues, a donor-acceptor polymer (ArMT) consisting of benzene rings and triazine was successfully synthesized and modified onto commercial polypropylene (ArMT@PP) as separators for LMBs. Benefitting from the highly lithiophilic triazine organic units, this ArMT exhibits affinity towards Li