The invention provides a plasma electrolysis liquefaction device, and relates to plasma. In a first scheme, the plasma electrolysis liquefaction device is provided with a reaction chamber, an insulating cover, a ground electrode swinging groove, a support rod fixing end, a fixing groove, an air outlet hole, a high voltage electrode, a ground electrode, an insulating sleeve, a nanosecond pulse square wave power supply and a stepping motor driving system. In a second scheme, the plasma electrolyzing device is provided with a reaction chamber, an insulating cover, a ground electrode translation groove, a slider, a fixing groove, an air outlet hole, a high voltage electrode, a ground electrode, an insulating sleeve, a nanosecond pulse square wave power supply and a stepping motor driving system. On the basis of changing power supply parameters and increasing electrode swing, not only are liquefaction parameter conditions improved, but also the liquefaction area is expanded, so that biomasscan be quickly liquefied by salts.