The work aims to research a TOPSIS comprehensive evaluation method based on the rough set theory to evaluate the green level of the package, so as to reduce the environmental pollution caused by the package. The green packaging evaluation system was constructed with five aspects including environment, resource, energy, function and economy. The rough set theory was used to determine the weight and TOPSIS method, while the greenness of package was rated and ranked. The feasibility of this method was verified by a case study. Based on the evaluation method combining rough set theory with TOPSIS method, the objective ranking results were obtained and the optimal green packaging scheme was selected. Based on the rough set theory and TOPSIS packaging evaluation method, the green package can be evaluated and the objective and effective evaluation results are obtained.