Method and device for automatically carefully sorting and grading shrimps

The invention discloses a device for automatically carefully sorting and grading shrimps. The device comprises a feeding system, a sorting channel, an image collecting system, a grading system and an image processing system; the feeding system is used for outputting to-be-sorted shrimps to the sorting channel in a single row; the sorting channel consists of a buffering channel and a sampling channel which are sequentially connected, the sampling channel is divided into a plurality of single-row channels, the buffering channel is internally provided with a plurality of direction adjusters, and used for separating raw material shrimps, output by the feeding system, into singles, and adjusting the posture of each raw material shrimp entering single-row channel; the image collecting system is used for collecting images of the raw material shrimps; the grading system comprises spray nozzles corresponding to single-row channels, and the spray nozzles are controlled by the image processing system and used for blowing the shrimps to enter different receiving tanks; the image processing system is used for analyzing the images, grading the image of each shrimp, and emitting the signal for controlling the grading system according to the graded results. The invention further discloses a method for automatically carefully sorting and grading shrimps.