We have invented a new kind of tool, that is hydraulic steel rods cutter. With the product everyone can cut ø18mmany size steel rods with one's hand easily. The product can be applied to cutting metal structures and metal materials such as steel reinforcement bars . It can widely be used in the callings of construction, electrical power etc. It is especially suitable for emergency operation under special condition (such as fire control) as well as for some works without electricity such as aerial and field works. Except its significant feature of force-saving, It also has the advantage of noiseless, safe, portative, time-saving, small in volume and easy for operation.