The utility model provides a deviation correcting device. The utility model provides a simple structure improves the deviation correcting device that the reliability was carried to the conveyer belt. Including frame, support, preceding conveying roller, back conveying roller, motor, inductor and dancer rools, support, preceding conveying roller and back conveying roller are established respectively in the frame, the support is located between preceding conveying roller and the back conveying roller, the support includes upper bracket and lower carriage, the lower carriage is in through a support connnection on the upper bracket, motor and inductor are established between upper bracket and the lower carriage, the dancer rools is established in the frame, and be located the below of motor, the inductor is connected the motor, the electric machine control the dancer rools action. The utility model discloses at work, the conveyer belt passes from the inductor, if the conveyer belt skew, inductor feedback signal gives the motor, and the motor is in the certain angle of horizontal direction swing for the dancer rools is in the opposite rotation of horizontal direction to conveyer belt skew, to the conveyer belt action of rectifying a deviation.