In order to expand the application of composite gel in packaging field, the effect on the microstructure of composite gel by PEG was studied. Also the swelling property and thermal stability of composite hydrogel were studied. In this study, polyethylene glycol (PEG) and cellulose nanofibers (CNFs) were used as the pore forming agent and the reinforcing phase, respectively. And the porous nano cellulose/polyvinyl alcohol composite hydrogel was prepared by physical crosslinking method. The results showed that the interpenetrating network structure of porous hydrogel could be prepared when PEG was used as the pore forming agent. Compared to pure PVA hydrogel the swelling degree of composite hydrogel has been greatly improved, which could reach to 1000. Meanwhile, composite hydrogel had better thermal stability with CNFs incorporated compared to pure PVA hydrogel. In conclusion, Porous composite hydrogel can be used in preservation of packaging products and logistics protection.