A lawn mower robot may include an inner body; an outer cover; wheels rotatably mounted; a rotating plate rotatably mounted on a bottom surface of the inner body; a plurality of blades spaced apart from each other in a circumferential direction of the rotating plate; and a blade protection cover formed to be spaced apart from the blades, wherein the blade protection cover comprises a plurality of protrusion portions spaced apart from each other on a circular arc in front of a blade protection cover body, and a distance between the plurality of protrusion portions is formed to be smaller toward both side end portions with respect to a front-rear directional center line of the blade protection cover.