Device for preventing deviation of conveying belt

The utility model relates to the technical field of plate processing equipment, in particular to a device for preventing a conveying belt from deviating. A driving roller and a driven roller are rotationally arranged between two support plates of the device, the diameter of the driving roller is gradually decreased from the middle to the two ends, the driving roller comprises a driving roller body, a rubber roller sleeve is arranged on the outer surface of the driving roller body, and a plurality of spiral grooves are formed in the outer surface of the rubber roller sleeve at intervals. The diameter of the driven roller is gradually reduced in the direction from the middle to the two ends, roller frame plates are arranged on the outer sides of the front ends of the two support plates, tensioning assemblies are arranged on the two roller frame plates, and the driven roller shaft is connected with the tensioning assemblies; according to the aluminum plate polishing device, the aluminum plate can be conveyed to