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In terms of the requirement of automatically sorting pearls,the pearl contour feature extraction and shape recognition algorithm are studied in this paper to reckon with the rapid identification of pearls shape online,and a monocular dynamic machine vision-based pearl shape detection device is designed.Through blowing,the pearl is suspended in a funnel shaped container and flipped rapidly in the device.The entire surface image of the pearl to be measured can be promptly grasped by the camera placed right above the funnel.The results of illumination experiments conducted from different angles indicate that the image contour acquired by the medium angle illumination is better extracted.The pearl shape test indicates that the method is incorporated with the inflatable suspension device to classify the pearls into seven types according to the national standard,and additionally the average error rate is confined under 5.38％.The shape characteristic of the pearl can be detected promptly and reliably,and accordingly the high-speed automatic sorting can be satisfied.