Hydraulic tools are the organic combination of hydraulic systems and common tools into one whole. The powerful hydraulic power is converted into mechanical movements such as reciprocating linear movements, rotary movements and pendulum movements. A complete hydraulic tool system consists of five parts, namely power elements, actuating elements, control elements, auxiliary elements and hydraulic oil. Hydraulic tools include: hydraulic spanners, electric pumps for hydraulic spanners, hydraulic jacks, hydraulic bolt tensioners, hydraulic flange separators, hydraulic nut breakers, hydraulic pulling horses, etc. Hydraulic tools have the advantages of being efficient and convenient.