Adjustable corn seed screening device

The invention relates to the technical field of crop screening, in particular to an adjustable corn seed screening device.The adjustable corn seed screening device comprises a scrap screening assembly and a particle screening assembly, the scrap screening assembly comprises a screening drum, a negative pressure screening mechanism, a stirring mechanism and a valve mechanism, and the top and the bottom of the screening drum are provided with a feeding pipe and a discharging port correspondingly; the negative-pressure screening mechanism comprises a screening hopper and an annular supporting plate, a circle of cavity is formed among the screening hopper, the annular supporting plate and the screening drum, a negative-pressure pipe is formed on the outer wall of the screening drum, the particle screening assembly comprises a vibration disc and a material collecting box, a plurality of variable-diameter channels are formed in the vibration disc, each variable-diameter channel comprises a variable-diameter sleeve