The invention discloses a piezoelectric crystal electrical displacement feedback loading port independent control hydraulic impactor. A variable pump is directly driven by a motor, an output port of the variable pump is respectively connected with an input port of a proportional relief valve and an inlet of a one-way valve; an outlet of the one-way valve is respectively connected with a displacement transducer, P ports of a first proportional directional valve and a second proportional directional valve and an inlet of the relief valve. A rod cavity and a non-rod cavity of a hydraulic cylinder are respectively connected with the A ports of the first and the second proportional directional valves, a controller is electrically connected with the first and the second proportional directionalvalves, the proportional relief valve and the piezoelectric crystal. The invention adopts the voltage outputted by the piezoelectric crystal to detect the impact displacement of a piston rod of the hydraulic cylinder, the controller presets the input control signals of the proportional directional valve and the proportional relief valve in phases so as to achieve high-frequency and rapid impact of the piston rod of the hydraulic cylinder on the impact objects, meanwhile, stepless regulation of impact displacement and impact power is realized according to the need of working status.