The invention provides an optical diffusion film, which comprises a hardened resin that is made from the cross bonding and hardening of a double hexacyclic acrylic acid monomer and a urethane acrylateThe invention provides an optical diffusion film, which comprises a hardened resin that is made from the cross bonding and hardening of a double hexacyclic acrylic acid monomer and a urethane acrylatemonomer, an optical diffusing particle and a hardening agent; wherein the introduction of the double hexacyclic acrylic acid monomer can raise the surface hardness and the yellowing resistance, and t monomer, an optical diffusing particle and a hardening agent; wherein the introduction of the double hexacyclic acrylic acid monomer can raise the surface hardness and the yellowing resistance, and the addition of the urethane acrylate monomer can increase the adhesiveness to a base material.he addition of the urethane acrylate monomer can increase the adhesiveness to a base material.