The double vibration motor is used to drive the screen body to do periodic reciprocating linear motion along the direction of excitation force, and the material moves forward in a straight line on the screen surface, and the separation of different particle sizes is achieved through the multi-layer screen. It has the characteristics of large processing capacity and high screening accuracy. Commonly used in quartz sand, limestone and other ore materials screening, but also suitable for plastic particles, abrasives and other industrial products classification treatment.