Air draft system of laser cutting machine

The utility model discloses an air draft system of a laser cutting machine, which comprises two symmetrically arranged air draft ducts, a cross beam and a vertical plate, a plurality of dust suction ports are arranged on the air draft ducts, each air door mechanism is driven by an air cylinder, the air cylinder is connected with an air pipe, and the air pipe is connected with the cross beam. Each air pipe wiring structure comprises an air pipe passing hole formed in the upper surface of the air draft air channel, a first pipe passing opening and a second pipe passing opening, wherein the first pipe passing opening and the second pipe passing opening are formed in the vertical plate and communicate with each other. According to the air draft system provided by the invention, the internal space of the vertical plate is ingeniously utilized for wiring, so that the connecting pipe of the air cylinder does not need to be subjected to long-distance exposure arrangement at the top of the air draft duct, and the conn