The invention relates to the technical field of laser cutting, in particular to a laser cutting machine convenient for waste treatment, which comprises a workbench and a cutting assembly, the cutting assembly is located above the workbench, the center of the workbench is provided with a blanking groove, and the workbench is provided with a sealing cover, a fresh air assembly, a collecting mechanism and an adjusting assembly. When a workpiece is cut through the cutting assembly, the workpiece is placed above the blanking groove, after being cut, the workpiece falls into the collecting mechanism through the blanking groove, waste and finished products are screened through the collecting mechanism, the waste cannot be scattered while the finished products are conveniently collected, and through the arrangement of a sealing cover, in the cutting process, the cutting efficiency is greatly improved. Smoke dust and molten slag do not fly up, the interior of the sealing cover is always kept in a re-pressing state through the fresh air assembly, the smoke dust and the molten slag are discharged from the lower end of the equipment, damage of the smoke dust to workers is reduced, the adjusting assembly is used for controlling the size of the discharging groove, and finished products and waste materials can be conveniently and separately collected.