The invention discloses a classified screening assembly line which comprises a modularized rack, a classified output device, a high-speed visual detection device, a modularized putting device, an overturning conveying device, a third material arranging device, a second material arranging device, a first material arranging device, a feeding device, a vibrator, a belt conveyor, a support, a roller and an air cylinder. According to the classified screening assembly line provided by the invention, an independently researched and developed high-speed visual detection system is adopted, and a product rotates on a conveying rotating wheel of the overturning conveying device on the overturning conveying device, so that 360-degree high-definition detection of materials can be completed in the rotating process of the materials, the problems that the detection is unreliable and the accuracy is low due to single detection at several angles are solved, the original sorting efficiency is improved by 6 to 8 times, and the accuracy can be greatly improved through a deep learning system.