Abstract: The paper proposed a design scheme of visible belt-broken diagnosis system of steel rope core belt. In the system, electromagnetic sensors detect steel rope core belt based on magnetic flux leakage detection technology. When broken parts are detected, the lower computer calculates the coordinate firstly, and then control X-ray testing part move to the coordinate for photographing. The upper computer processes image data from the lower computer, confirms belt-broken type and displays alarming message at corresponding coordinates on monitoring interface with images showing. The testing result showed the system realizes real-time visible detection of steel rope core belt with high correctness and small error.