The utility model relates to the field of grass mowers, and provides a
lawn mower which comprises a
mower body and a positioning device, the positioning device comprises a fixing
assembly and a positioning rod, the fixing
assembly is suitable for being installed on the
mower body and is provided with a horizontal installation position and a vertical installation position, one end of the positioning rod is suitable for being installed on the vertical installation position or the horizontal installation position, and the other end of the positioning rod is provided with a visual guiding part; when the positioning rod is mounted at the horizontal mounting position, the positioning rod extends horizontally, and the visual guide part extends to the side area of the
machine body; and when the positioning rod is mounted at the vertical mounting position, the positioning rod vertically extends. A positioning rod is installed on the side face of the green
lawn mower through a fixing
assembly, one end of the positioning rod is fixed to the
lawn mower, and the other end of the positioning rod is provided with a visual guiding part close to the ground. During operation, the visual guide part extends towards the side of the
machine body, is aligned with the edge of a green lawn, and moves along the edge to guide the
lawn mower to operate within a specified range; after trimming, the positioning rod can be vertically fixed to the grass mower, and the visual guiding part is located above the
machine body and does not hinder normal movement of the machine body.