The invention discloses an edging device and method based on visual control. A conveying unit is used for conveying to-be-edged workpieces; image acquisition modules of visual control units are used for acquiring image data of the to-be-edged workpieces and send the image data to an image processing module, and the image processing module acquires contour features reflecting edges of the workpieces on the basis of the image data and acquires G codes for processing by a numerical control system according to the contour features; and finally, edging units are used for edging the to-be-edged workpieces efficiently according to the G codes under control of the control system. The edging device and method adopt the visual control manner so that edges of tableware trays are ground automatically, the visual control units and the edging units located at different stations are used for realizing high-precision acquisition of tableware contour images and high-precision grinding of the tableware edges, and the edging device and method have the advantages of high edging precision, high efficiency, easy operation, convenient maintenance and the like.