Barrier film and preparation method thereof

The invention belongs to the technical field of films, and relates to a barrier film and a preparation method thereof, the barrier film comprises an upper optical base film and a lower optical base film arranged up and down; one surface of the upper optical base film is coated with an anti-adhesion layer, and the other surface of the upper optical base film is coated with a high-molecular polymerization layer; one surface of the lower optical base film is coated with a water-oxygen barrier layer, and the other surface of the lower optical base film is coated with a pre-coating layer; and the water-oxygen barrier layer is attached to the high-molecular polymerization layer. According to the technical scheme, water and oxygen molecules entering the barrier film from the side face and the endface can be reduced, so that the barrier performance of the barrier film is guaranteed, the invention further provides a preparation method of the barrier film, the production process is simple, andthe production cost is red