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In this paper, based on the TEMPO oxidated Cellulose Nanofiber (TOCNF)/ɛ-poly-l-lysine (ɛ-PL) cross-linking network and citric acid as the cross-linking agent, aerogel material was designed. Citric acid (CA) can be used as a multifunctional cross-linking agent with TOCNF esterification cross-linking, and with TOCNF and ɛ-PL hydrogen bond cross-linking, but also as a reinforcing agent to improve mechanical and antibacterial properties. When the ɛ-PL content reached 0.8%, the tensile strength of the aerogel increased from 12.03 MPa to 26.