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 coupled to an edge portion of the rotating plate to be unfolded in a centrifugal direction and folded in the direction of the center of the circle, and spaced apart from each other in a circumferential direction of the rotating plate to cut grass while rotating around the rotating shaft of the rotating plate； and a blade protection cover formed to be spaced apart from the blades to prevent a fragment of an obstacle from being thrown out of the outer cover due to collision with the blades, wherein the blade has a cross-sectional shape of a parallelogram and is formed of a plate having a predetermined width in a longitudinal direction.
