High frequency vibrating screen is composed by the driver, the pulp divider, screen frame, rack, part compositions and so on pendulum spring and strainer. The high frequency screen capacity is high, the oscillation amplitude is small, the screening frequency is high. It's different with the ordinary sizing device's principle, because high frequency vibrating screen has used the high-frequency, on the one hand it destroyed the pulp surface tensity and the fine grain material in screening surface high speed vibration, has accelerated the great density (proportion) the utility and the separation function, the increased is smaller than separates the granularity material and the mesh contact probability. Thus has created the good separation condition, smaller separation granularity material, specially the proportion big thing grain and the pulp penetrates the mesh to become together undersizes the product.