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Using a quaternization reaction to cross-link the soft bromohexylated polystyrene-b-poly­(ethylene-co-butene)-b-polystyrene (SEBS-C6-Br) skeleton with the more brittle quaternized poly­(triphenylpiperidine) skeleton (Qr-m-PTP), we prepare a nQr-m-PTP-c-SEBS-C6 composite membrane. The research results show that the conductivity of the 0.68Qr-m-PTP-c-SEBS-C6 membrane can reach 91.8 mS/cm at 80 °C, and the OH– conductivity only decreases by 5.18% after immersing in 4 M NaOH for 1400 h. Both the dimensional stability and mechanical properties have been enhanced. The microphase separation channels after the two frameworks are cross-linked and promote the ion conductivity of the anion exchange membrane, and the high degree of cross-linking also has a good inhibitory effect on the swelling of the membrane. This kind of cross-linked membrane is useful in alkaline membrane fuel cells.