A plasma generating device (100; 200) comprising: a plasma generating module (110; 210) for generating a plasma; and a rotating body comprising at least one plasma nozzle for blowing said plasma to the outside of said plasma generation device (100; 200); and is provided separately from the plasma generating module to be rotatably disposed on the outside of the plasma generating module, wherein the plasma generating module comprises: a high-voltage electrode which is disposed in the central area of said plasma generating module; a counter electrode (131, 132) which is disposed around the high-voltage electrode for generating a high voltage arc when charged with power applied to the high-voltage electrode; and a gas inlet which is provided between the high-voltage electrode and the counter electrode (131, 132), wherein the counter electrode (131, 132) comprises: a first counter electrode having a cylindrical shape; and a second counter electrode having a funnel shape and detachably connected to the first counter electrode; wherein the rotating body further comprises: a rotor (181; 182) which is rotatably disposed on the outside of the plasma generating module; and a discharge head which is provided with the plasma nozzle, and is detachably connected to an end of the rotor (181, 182), and has a width gradually increasing to its end, wherein said gas inlet is for injecting compressed air or gas into said discharge head; characterized in that the rotor (181, 182) comprises: a first rotor which is rotatably disposed radially on the outside of the first counter electrode with a bearing interposed therebetween; and a second rotor of which one end is detachably connected to the first rotor and the other end is detachably connected to the discharge head. a plasma generating module (110; 210) for generating a plasma; and a rotating body comprising at least one plasma nozzle for blowing said plasma to the outside of said plasma generation device (100; 200); and is provided separately from the plasma generating module to be rotatably disposed on the outside of the plasma generating module, wherein the plasma generating module comprises: a high-voltage electrode which is disposed in the central area of said plasma generating module; a counter electrode (131, 132) which is disposed around the high-voltage electrode for generating a high voltage arc when charged with power applied to the high-voltage electrode; and a gas inlet which is provided between the high-voltage electrode and the counter electrode (131, 132), a high-voltage electrode which is disposed in the central area of said plasma generating module; a counter electrode (131, 132) which is disposed around the high-voltage electrode for generating a high voltage arc when charged with power applied to the high-voltage electrode; and a gas inlet which is provided between the high-voltage electrode and the counter electrode (131, 132), wherein the counter electrode (131, 132) comprises: a first counter electrode having a cylindrical shape; and a second counter electrode having a funnel shape and detachably connected to the first counter electrode; a first counter electrode having a cylindrical shape; and a second counter electrode having a funnel shape and detachably connected to the first counter electrode; wherein the rotating body further comprises: a rotor (181; 182) which is rotatably disposed on the outside of the plasma generating module; and a discharge head which is provided with the plasma nozzle, and is detachably connected to an end of the rotor (181, 182), and has a width gradually increasing to its end, a rotor (181; 182) which is rotatably disposed on the outside of the plasma generating module; and a discharge head which is provided with the plasma nozzle, and is detachably connected to an end of the rotor (181, 182), and has a width gradually increasing to its end, wherein said gas inlet is for injecting compressed air or gas into said discharge head; characterized in that the rotor (181, 182) comprises: a first rotor which is rotatably disposed radially on the outside of the first counter electrode with a bearing interposed therebetween; and a second rotor of which one end is detachably connected to the first rotor and the other end is detachably connected to the discharge head. a first rotor which is rotatably disposed radially on the outside of the first counter electrode with a bearing interposed therebetween; and a second rotor of which one end is detachably connected to the first rotor and the other end is detachably connected to the discharge head.