The invention discloses a maize sorting device capable of finely adjusting the angle of a vibration screen. The maize sorting device comprises the oblique vibration screen driven by a vibration motor and an air suction cover is arranged on the upper portion of the vibration screen. The air suction cover is communicated with an air suction pipe and a feeding box. One side of the vibration screen is hinged to a mounting seat and the other side is arranged on an angle adjustment assembly. An impurity discharging pipe is arranged beside the vibration screen. The angle adjustment assembly comprises a vertically-arranged guide rod. An outer thread is arranged on the periphery of the guide rod. The upper portion of the guide rod is in threaded connection with an adjustment sleeve. The upper end face of the adjustment sleeve is provided with an inclined face. The vibration screen is supported on the inclined face.