The present disclosure relates to a lawn mower robot, including an inner body； an outer cover configured to surround an outer side of the inner body； wheels rotatably mounted at both sides of the inner body, respectively； a rotating plate rotatably mounted on a bottom surface of the inner body, and disposed to be inclined downward with respect to a horizontal plane in a traveling direction of the inner body； a plurality of blades spaced apart from each other in a circumferential direction of the rotating plate to cut grass while rotating around a rotation shaft of the rotating plate； and a blade protection cover formed to be spaced apart from the blades to prevent a fragment generated due to a collision with the blades from being thrown out of the outer cover, 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.
