The present invention relates to the field of release film preparation, and provides a method for preparing antistatic anti-UV modified PET / PC release film. The method includes a modified preparation of a composite base membrane, preparation of a coating liquid for a release layer, compound machine coating of an ultraviolet-resistant composite UV absorbent, and the heat curing and light curing of coated base membrane. The modified PET / PC composite release film prepared by the method has effectively improved stiffness and strength; heat curing and light curing make the outer ultraviolet-resistant layer more stable. The release film has excellent mechanical properties, good processability, and good anti-static and anti ultraviolet performance.