Full-hydraulic multifunctional power head

The utility model relates to a full-hydraulic multifunctional power head, which comprises a water injection device, a hydraulic motor, a buffer and a transmission device. A driving gear, a gear ring and a spline shaft of the transmission device are mounted in a rotation box, a spline sleeve is arranged between the gear ring and the spline shaft, outer splines of the spline sleeve are meshed with the gear ring, inner splines of the spline sleeve are meshed with the spline shaft, a needle roller bearing and a thrust bearing are respectively arranged between the spline sleeve and a front end cover and between the spline sleeve and a rear end cover, the buffer is mounted in the front of the front end cover, an impactor is mounted on the rear of the rotation box, and the water injection device is mounted in the front of the spline shaft. The full-hydraulic multifunctional power head has the advantage that the power head not only can realize rotary drilling with large torque, but also can realize a drilling method combining rotating and impacting, and increases drilling speed in pebble beds and rock beds.