Abstract: In view of problems of uncertainty and locality of information obtained by a single sensor in process of fault diagnosis of belt conveyor, the paper proposed a fault diagnosis method based on multi-sensor fuzzy information fusion. The method fuzzes information of belt conveyor obtained by temperature sensor, dust sensor and smoke sensor, fuses the information through synthetic operation and decision rule in fusion center, so as to get accurate estimation and judge of state of the belt conveyor. The experimental result shows that the method improves accuracy and reliability of the fault diagnosis of belt conveyor.