Laser cutting machine stable in cutting

The utility model discloses a laser cutting machine stable in cutting, which comprises a machine body, a portal frame rail is erected on the machine body through guide rails on two sides, a laser cutting machine head is mounted on the portal frame rail, a plurality of frame plates arranged at equal intervals are mounted on the top surface of the machine body, and a plurality of sawteeth are arranged on the upper portion of each frame plate at equal intervals. Four sets of limiting mechanisms are placed on the frame plates, each limiting mechanism is composed of a clamping base, a vertical plate, a clamping piece, a screw and a nut, two sets of inclined clamping grooves are formed in the bottom face of each clamping base, each clamping base is clamped between every two adjacent sawteeth through the corresponding two sets of inclined clamping grooves and erected on the two frame plates, the vertical plates perpendicular to the frame plates are fixed to the top faces of the clamping bases, and adjusting grooves