The work aims to reach a suitable humidity environment for the growth of fruits and vegetables by adjusting the humidity in the package, thus delaying the mildew and decay rate of fresh fruits and vegetables, prolonging their shelf life and reducing the loss rate of products. The superabsorbent resin PVA and the nano-zeolite were uniformly mixed to prepare a coating sol with moisture retention function, and the sol was applied to the base material PE of the package by coating method to obtain a new type of food packaging film with mildew prevention and fresh-keeping function. The mechanical property, barrier property and moisture permeability of the composite films were measured by electronic universal testing machine, oxygen permeation analyzer and moisture tester. The PVA nano-zeolite/PE composite film had lower impact on the physical properties of the film when the mass fraction of nano powder was about 1.0%, and it had higher moisture retention. Compared with the base material PE without coating treatment, its air permeability coefficient was greatly reduced, and the water vapor permeability was reduced by 20%. The composite film has potential application value in transportation and storage of fresh fruits and vegetables.