Abstract: For problem of frequent accidents of chain scission of heavy-duty scraper conveyor, a chain scission detection system of scraper conveyor based on stress mutation was designed. The system can detect by strcuin sensor in real time whether the chain breakage occurs, and accurately determine which chain is broken. The system is effective with simple operation, has high sensitivity and high accuracy, which overcomes shortcomings of existing detection technology. The simulation results verify the feasibility of the system.