The hydraulic internal combustion bolt wrench is a special machine for tightening and loosening the spike nuts (M22-M30) of railway, subway and light rail lines. It adopts mechanical transmission and hydraulic torque control. The output torque can be adjusted and set steplessly. It is suitable for tightening and loosening fastener bolts with different preload requirements. The whole machine has a compact structure, simple operation and high working efficiency. The machine is light and flexible, easy to operate, safe and reliable. It is an essential machine for railway engineering and engineering departments to carry out line construction, maintenance and emergency operations.