Opening hydraulic wrench

The invention discloses an opening hydraulic wrench. The opening hydraulic wrench is mainly composed of a motor-opening gear set mechanism, a hydraulic cylinder-ratchet wheel and pawl mechanism, a clamping mechanism, a reset mechanism, an arrival mechanism, a shell, a cover plate, a handle and a counter-force rod. The motor-opening gear set mechanism is driven by a hydraulic motor or motor, an opening gear set is used for driving an opening gear to continuously rotate, and the rapid screwing-on procedure is finished. The hydraulic cylinder-ratchet wheel and pawl mechanism is driven by a hydraulic cylinder, a ratchet wheel and pawl mechanism is used for pushing an opening ratchet wheel to intermittently rotate, and the preset-torque tight buckling procedure is finished. The clamping mechanism can conduct reliable clamping on a to-be-installed target, the reset mechanism is used for hydraulic wrench reverse rotating and positioning, and the arrival mechanism controls the maximum stroke of the hydraulic cylinder