Abstract: In view of problems of low sensitivity, inconvenient operation and non-visualization of existing detection methods of conveyor belt longitudinal tear, a detection method of conveyor belt longitudinal tear based on Hough transform was proposed. Lower surface image of conveyor belt is collected in real-time by use of CCD with line light source as auxiliary irradiation, and slope difference characteristics of the image are extracted through Hough transform, so as to determine whether longitudinal tear of conveyor belt happens. The test result verifies effectiveness of the method.