Laser structure of laser marking instrument suitable for automatic calibration

The invention discloses a laser structure of a laser marking instrument suitable for automatic calibration, the laser structure comprises a pendulum body frame and a laser, the pendulum body frame is provided with a mounting groove, the laser is mounted in the mounting groove, the laser structure is characterized in that a pre-tightening mechanism is arranged in the mounting groove, two sides of the pendulum body frame are respectively provided with a dispensing hole communicated with the mounting groove, and the dispensing holes are communicated with the mounting groove. And a counterweight hole is formed in the lower part of the pendulum body frame. By arranging the pre-tightening mechanism, after the laser is placed in the mounting groove, the laser can be fixed through the pre-tightening mechanism, the elastic piece in the pre-tightening mechanism can be compressed to generate a pushing force to prevent the laser from moving in the mounting groove, and meanwhile, due to the deformability of the elastic pi