Adopts rational optimized design and arrange, high inverter frequency, high duty cycle, economy and energy saving Subminiature volume, lightweight, easy to carry, is especially suitable for moving job outdoor. Compared with flame cutter, the air plasma are cutter use cheaper compressed airs as cutting gas supply and has the advantages of low cost and high speed etc. Compared with traditional cutter, has the advantages of high success rate for arc initiation, high arc voltage, concentrated heat, powerful cutting ability, high cutting speed, narrow kerfs, smooth cut face, less deformation. Can cut metal plate along curve line in different thickness, cutting current digital display, cutting current adjust steplessly, accurate and read directly. Built in over heat, over current, over voltage and low voltage protection circuit, operating safely.