The utility model discloses a detachable derrick buffering device. Oil cylinder, a fixed bracket is welded and fixed on the side surface of the oil cylinder; Protruding cylinders are arranged on the two opposite sides of the fixing support. a connecting seat sleeves the outer side of the fixed bracket; the inner diameter of the connecting seat is greater than the outer diameter of the fixed bracket; A positioning groove matched with the protruding cylinder of the fixing support is formed in one end face of the connecting base. An axial baffle is arranged on the other end face of the connectingbase, a groove enabling the fixing support to pass through is formed in the inner wall of the connecting base, the oil cylinder can conveniently disengage from the connecting base, a detachable pressing plate is arranged on an end opening of the positioning groove, and the pressing plate is fixedly connected with the connecting base through a bolt. The derrick buffering device solves the problemthat an oil cylinder of an existing derrick buffering device cannot be disassembled and maintained in the erecting and working processes of a derrick.