The invention relates to a fracturing device used for an oil-gas pipe column. The device comprises a cylindrical assembly connected with the oil-gas pipe column in series and used for defining buffer space for receiving fluid in the oil-gas pipe column, a sliding sleeve fixedly arranged on the inner wall of the cylindrical assembly through a cutting unit and an actuating mechanism capable of pushing the sliding sleeve. When the actuating mechanism pushes the sliding sleeve to force the cutting unit to lose efficiency, the sliding sleeve enters the buffer space and performs buffer motion under the combined effect of the buffer space and the fluid. The fracturing device used for the oil-gas pipe column has following beneficial effects: due to the fact that the e fracturing device used for the oil-gas pipe column can timely buffer movement of the sliding sleeve, friction loss and collision damage to the sliding sleeve, an outer cylinder and related parts can be greatly reduced so that service life of the fracturing device is prolonged.