Lawn mower: it is a mechanical tool for mowing lawn and vegetation. It is composed of cutter head, engine, walking wheel, walking mechanism, blade, handrail and control part. The cutter head is installed on the walking wheel, the cutter head is equipped with an engine, and the output shaft of the engine is equipped with a blade. The blade uses the high-speed rotation of the engine to improve the speed, which saves the operation time of weeders and reduces a lot of human resources.