The cleaning device of the seed cleaning and screening machine uses water or air flow to clean the seeds and remove surface dust and attachments. The screening device uses vibrating screens, drum screens, and other devices to screen the cleaned seeds, separating out impurities, small particles, damaged particles, and other seeds that do not meet the requirements. The electronic control device controls the entire cleaning and screening process, including adjusting parameters such as cleaning time and screening speed. The conveying device transports the cleaned and screened seeds to the designated location for subsequent processing or packaging.