The work aims to prepare a physico-chemical double-crosslinked hydrogel packaging material with antibacterial and antioxidant properties and study the effects of nanocellulose and tannic acid on hydrogel properties. With nanocellulose (CNF), tannic acid (TA), acrylic acid (AA) and acrylamide (AM) as raw materials, the functional nanocellulose-based hydrogel with physico-chemical double-crosslinked structure was prepared by "one-pot method", and the mechanical properties, water retention, oxidation resistance, antibacterial property and slow-release properties of the hydrogel were studied. The free radical copolymerization crosslinking reaction occurred between acrylamide and acrylic acid under the action of crosslinking agent, and the chains entangled with each other to form a three-dimensional crosslinked network. The hydrogen bonds between the copolymer molecular chains, CNF and TA facilitated the formation of the second physical crosslinked network, enhancing the water retention of the hydrogel. After the incorporation of nanocellulose, the compressive strength of the hydrogel increased by 83.7% at 85% strain. After the incorporation of TA, the hydrogel exhibited excellent antibacterial properties, with superior inhibitory effects on Gram-positive bacteria. Moreover, the tannic acid in the modified hydrogel could be gradually released from the hydrogel within 70 h, showing a good slow-release property. The hydrogel formed by constructing double crosslinked networks exhibits excellent water retention, antibacterial, and antioxidant properties, suggesting their potential for widespread application in food packaging.