A plasma treatment system (1) includes a spout (18), a suction hole (19), a first electrode (15) and a second electrode (16), an impedance acquisition unit (201), a liquid volume adjustment unit (5), and a first control unit (203). The first electrode (15) and a second electrode (16) are configured to generate plasma to treat a living tissue by the application of a voltage. The impedance acquisition unit (201) acquires impedance between the first electrode and the second electrode. The liquid volume adjustment unit (5) adjusts the supply volume or suction volume of the electrically conductive solution. The first control unit (203) controls the liquid volume adjustment unit to increase or decrease the supply volume or suction volume of the electrically conductive solution based on the impedance.
