Fixing device for filtering gas cylinder of cutting machine

The utility model belongs to the technical field of fixing, and discloses a fixing device for a filter gas cylinder of a cutting machine, the fixing device comprises a positioning frame, a fixing mechanism is arranged in the positioning frame, and the fixing mechanism extends to the outer side of the positioning frame; the fixing mechanism comprises two connecting rods, the two connecting rods are fixedly connected to the interiors of the two sides of the positioning frame, electric hydraulic push rods are fixedly connected to the inner ends of the two connecting rods, and connecting frames are fixedly connected to the inner ends of the two electric hydraulic push rods. The two electric hydraulic push rods, the two connecting frames, the four springs, the four pull rods, the four limiting discs and the four fixing plates are matched with one another, so that the four fixing plates are tightly attached to the outer sides of the two ends of the filtering gas cylinder respectively, the filtering gas cylinder is