Node-anchored protic ionic liquids were immobilized in MOF-808 through Zr-node post-modification to construct stable proton-conducting pathways. Cationic sulfonic acid groups strengthen hydrogen-bond networks and promote Grotthuss-type proton transport. PSO3MImH2PO4@MOF-808 achieved 3.19 × 10-3 S cm-1 at 80 °C and 95% RH with excellent stability.