In order to study the mechanical properties and buffering effect of pulp molding materials on printer during storage and transportation, the printer buffer unit was designed. Based on the technical parameters of the printer, the mechanical properties of static stacking and dynamic impact of the printer buffer unit were simulated and analyzed by using finite element analysis software. The results showed that with 744.8 N static load applied on the printer stacking unit, the maximum static stress appeared on the corrugated box as being 0.47 MPa, less than the limit stress of 2.38 MPa. When the printer buffer unit fell in angular contact, the maximum equivalent stress of the printer buffer unit was 6.25 MPa, exceeding its limit stress, while the maximum stresses of the lower pad and the printer were 0.38 MPa and 0.11 MPa respectively, less than the limit stresses of pulp molding materials and ABS of 2.00 MPa and 49.00 MPa. The corrugated box absorbed the energy generated in the impact process and played a good role in protecting the contents. Therefore, the cushion pad designed by pulp molding could protect the printer, improve the safety in storage and transportation, and more importantly, it conformed to the green packaging design concept of sustainable development.