The paper proposes a new vision-based inspection of car circlips. Due to the variety of circlips and large quantity, human inspection about its inside diameter, ring width is always subjective, labor-intensive and slow. The detector consists three parts: electromagnetic feeder, vision-based detection system and multi-station workbench. The feeder is customized to accomplish storage, screening, sorting and transmission of circlips. Vision system is made up of bilateral telecentric lens, tablet light and industrial camera. By means of image processing, it can detect dozens of circlips which it maximum outside diameter is less than 25.00mm. And the precision of inside diameter can reach up to 0.02mm. A multi-station workbench method is put forward in order to improve detecting efficiency combined with parallel software. The system can sort 60-80 pieces per minute.