Protecting device of laser cutting machine

The invention relates to the technical field of laser cutting, in particular to a protecting device of a laser cutting machine. The protecting device of the laser cutting machine comprises a working table, wherein the working table is movably connected with a supporting rack; a first fixing block is fixedly arranged at the position of the middle of the supporting rack; the lower end of the first fixing block is fixedly connected with a cutting head; a fixing plate is fixedly arranged on the first fixing block and is positioned below the supporting rack; the fixing plate sleeves the first fixing block; the two sides of the lower surface of the fixing plate are separately fixedly connected with connecting rods; the end, which is away from the fixing plate, of each connecting rod is fixedly connected with a protecting plate; a through hole is formed in each protecting plate and is positioned below the cutting head; second fixing blocks are fixedly arranged on the supporting rack and are positioned on the two sid