Down-the-hole drill casing shackle device

The invention discloses a down-the-hole drill casing shackle device. According to the device, locking and fixing of a lower casing, clamping of an upper casing and continuous rotary dismounting of a screw thread in the casing pulling-out process can be completed at a time through the down-the-hole drill casing shackle device. The device comprises a lower bottom plate part and an upper bottom plate part, wherein the upper bottom plate part can move upwards along a guide column when a shackle is rotated; the lower bottom plate part comprises a lower bottom plate, a clamping oil cylinder, a lower clamping block, a guide column and the like; the upper bottom plate part comprises an upper bottom plate, a hydraulic motor speed reducer, a rotary locking mechanism and the like; the rotary locking mechanism is connected with a rotary clamping ring of the upper bottom plate and can rotate around the center; the lower bottom plate and the upper bottom plate are connected through the guide column, and a rubber buffer sle