Hydraulic opening device is simple, effort, speed,Spray metal sucker rod coupling processing surface smooth and clean, but also from the site, the position limits can be used, safe and reliable. Hydraulic opening device structure lightweight, attractive, and easy to carry, for the metallurgical, oil, chemicals, electronics, electrical appliances, shipbuilding, machinery and other industries pipeline API 7-1 Spec installation and maintenance of wires, lights, instrumentation switches and other openings, more suitable for the shaped instrument panel floor and wall openings of the switch box with a sub-line electrical box.