Smoke exhaust device of plasma cutting machine

The utility model relates to a smoke exhaust device of a plasma cutting machine, which structurally comprises a smoke collecting hood arranged above a plasma cutting machine body in a workshop in a covering manner, the smoke collecting hood is connected with one end of an air pipe, a smoke exhaust fan is mounted on the air pipe, and the other end of the air pipe extends out of the workshop and is connected with a filter box; one end of the butt-joint air pipe is in butt joint with an air opening in the side lower portion of the plasma cutting machine body, and the other end of the butt-joint air pipe is communicated with the air pipe. The device has the advantages that the concentration of smoke dust in a processing plant can be reduced, and the occupational health hazard of the smoke dust to constructors is reduced; the influence of smoke dust on the construction environment is reduced, and safe construction of workers is guaranteed. The smoke dust is treated and discharged to reach the green and environment