The work aims to discuss the effects of graphene (G) and graphene nanoplatelets (GN) on the mechanical property, color, light transmittance and oxygen permeability of low density polyethylene film, with graphene/low density polyethylene composite packaging materials as the research object. Melt-blending method was used to prepare graphene/LDPE composites with different mass fractions of graphene, and the change in their performances was tested and compared. The addition of G and GN could im-prove the elasticity modulus of LDPE film by 9%~50%, the transverse and longitudinal tensile strengths by 2%~30% and the oxygen permeability by 10%~15%; and reduce the light transmittance by 10%~60%. Because of the large surface area and high rigidity, graphene can significantly improve the mechanical properties of LDPE material, such as tensile strength and elastic modulus, as well as deepen its color and reduce the light transmittance of the film.