a colour grading device for small-grain agricultural products based on features of a surface layout, comprising a material conveyor, an information recording device, a foreign body removal device and a control device,where the control device is electrically connected to the information recording device and the external body removal device in order to perform a control function, the information recording device comprises a chamber with an input and an output,where at the exit of the chamber there is a channel for normal material and a channel for abnormal material,where the material handling device is connected to the entrance of the chamber and transports the material inside the chamber, with both the information recording device and the external body removal device located within the chamber,where the information recording device is used to identify an abnormal material, where the foreign body removal device is used to change a motion trajectory of the abnormal material to enter the abnormal material channel,where the normal material enters the channel for normal material,which enables effective screening and separation of abnormal materials.
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