Back-off device for sucker rod

The utility model discloses a back-off device for a sucker rod for the workover operation of a wax clamping well or a sand clamping well of an oil field, which comprises a casing 1, casing 2 and a a connecting and locking device. A tooth block is fixed on the casing, and the middle part of the casing is provided with a semicircle pipe. After the casing 1 and the casing 2 are locked tightly, the tooth block gnaws tightly the sucker rod, a fluidic pressure oil pipe tong is used for gnawing a central pipe composed of two semicircle pipes and the back-off device for the sucker rod and the sucker rod can be driven to rotate all together, and the purpose of fastener removing is reached. The utility model changes the defects that pipe pliers are used for removing the fasteners in a laborious way and people are easily hurt, and the utility model can remove the sucker rod of the wax clamping well or the sand clamping well in a safe, fast and laborsaving way.