The fully hydraulic power head structure is divided into three parts: the main engine, pump station, and control console. It has good disassembly performance, convenient relocation, and flexible drilling site layout; Mechanical unscrewing of drilling tools allows for linkage operation between chucks, grippers, and oil cylinders, as well as between rotators and grippers, with a high degree of automation, high work efficiency, simple operation, and low labor intensity for workers.