▎ 摘　　要

NOVELTY - The utility model claims a negative pressure roll-to-roll preparation device, comprising a pipeline, a pay-off mechanism, a take-up mechanism, a heating mechanism, a protective gas and a carbon source supply mechanism, a vacuum mechanism, a first valve, a second valve and a control mechanism, the pipeline comprises a first buffer area and a second buffer area, the first buffer area is located between the heating mechanism and the pay-off mechanism, the second buffer area is located between the heating mechanism and the take-up mechanism, the first valve is located between the first buffer area and the heating mechanism, The second valve is located between the second buffer area and the heating mechanism. through the first buffer area and the second buffer area, the first valve and the second valve can ensure that the protective gas provided by the protective gas and carbon source supply mechanism in the preparation process can keep the pressure corresponding to the heating mechanism area in the pipeline, avoiding the change of the pressure corresponding to the heating mechanism area when replacing the copper material on the pay-off mechanism and taking the graphene copper material on the take-up mechanism, improving the quality of the prepared graphene copper material.