Vibration analysis was carried out on die-cutting machine elbows bar mechanism in the actual conditions. Denmark B & K vibration test system and Japan FBD pressure test system were used to test die-cutting knife marks line and the pressure of the rubber strip. It was concluded that the number of balance knife is an important factor influencing the uniformity of cutting pressure. The purpose was to provide reference for determining knife layout to ensure the uniformity of die-cutting pressure and improve precision of die-cutting.