The invention discloses a gas-liquid combined hydraulic impacter. The gas-liquid combined hydraulic impacter disclosed by the invention comprises a valve body, a valve core and a double-sided oil feed/discharge impacter, wherein the double-sided oil feed/discharge impacter comprises a piston, a pilot operated directional control valve and an oil way; the tail end of the piston is provided with a nitrogen chamber, a joint of the nitrogen chamber and the piston is hermetically connected, and the tail end of the piston is arranged in the nitrogen chamber both in the processes of returning and stroking. The impacter disclosed by the invention is high in energy utilization ratio, so that the oil supply quantity of a valve pushing cavity is sufficient, thereby preventing the occurrence of a 'suction' phenomenon and reducing hydraulic shocks, vibration and noises, in such a way, the operations of the pilot operated directional control valve and the piston are stable, and the service lives of the pilot operated directional control valve and the piston are prolonged.