Limiting mechanism of laser cutting machine

The utility model discloses a limiting mechanism of a laser cutting machine, which comprises the laser cutting machine, a cutting table top is arranged at the top of the laser cutting machine, a clamping mechanism is arranged on one side of the cutting table top, an aligning mechanism is arranged at the top of the clamping mechanism, the clamping mechanism comprises a fixed seat, a two-way screw rod is rotatably connected in the fixed seat, and the two-way screw rod is arranged on the left side of the cutting table top. A clamping motor is fixedly connected to the end of the two-way screw, two clamping plates are connected to the two-way screw in a threaded mode, and the aligning mechanism comprises a pressing air cylinder; the clamping mechanism and the aligning mechanism are arranged, a clamping motor drives a clamping plate to move, a plurality of plate pipes are pushed and straightened, then a pressing air cylinder drives a rotating shaft to descend, so that rubber sleeves are tightly attached to the surf