Screening device for plastic granulation

The invention relates to the technical field of screening, in particular to a screening device for plastic granulation, which comprises a base, a material conveying pipe and a screening mechanism, the material conveying pipe is vertically arranged, and a first channel and a second channel which are mutually independent are arranged in the material conveying pipe; the multiple screening mechanisms are distributed in the vertical direction at intervals. Each screening mechanism comprises an adjusting assembly, a first-stage screen, a second-stage screen and a material collecting plate, wherein the first-stage screen, the second-stage screen and the material collecting plate are sequentially distributed in parallel from top to bottom. The tail ends of each first-stage screen and each second-stage screen are respectively communicated with the head ends of the first-stage screen and the second-stage screen of the adjacent screening mechanism below through connecting hoses; the adjusting assembly enables the second