A lawn mower robot, comprising: 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; at least one blade rotatably mounted at 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 at least one blade to prevent a fragment generated due to a collision with the at least one blade from being thrown out of the outer cover, wherein the blade protection cover comprises: a blade protection cover body; a tapered portion formed to be inclined downward along a circumferential direction at an edge portion of the blade protection cover body; and a plurality of protrusion portions spaced apart from each other on a circular arc at the front of a blade protection cover body, characterized in that the blade protection cover further comprises: a grass inlet formed at the front of the blade protection cover to ensure entry into the blade, wherein a height of the grass inlet is greater than a height of the blade, wherein the plurality of protrusion portions are disposed laterally to overlap at the grass inlet such that fragments are prevented from being thrown out in a lateral direction due to a collision with the blade rotating at the grass inlet. 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; at least one blade rotatably mounted at 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 at least one blade to prevent a fragment generated due to a collision with the at least one blade from being thrown out of the outer cover, wherein the blade protection cover comprises: a blade protection cover body; a tapered portion formed to be inclined downward along a circumferential direction at an edge portion of the blade protection cover body; and a plurality of protrusion portions spaced apart from each other on a circular arc at the front of a blade protection cover body, characterized in that the blade protection cover further comprises: a grass inlet formed at the front of the blade protection cover to ensure entry into the blade, wherein a height of the grass inlet is greater than a height of the blade, wherein the plurality of protrusion portions are disposed laterally to overlap at the grass inlet such that fragments are prevented from being thrown out in a lateral direction due to a collision with the blade rotating at the grass inlet. a blade protection cover body; a tapered portion formed to be inclined downward along a circumferential direction at an edge portion of the blade protection cover body; and a plurality of protrusion portions spaced apart from each other on a circular arc at the front of a blade protection cover body, characterized in that the blade protection cover further comprises: a grass inlet formed at the front of the blade protection cover to ensure entry into the blade, wherein a height of the grass inlet is greater than a height of the blade, wherein the plurality of protrusion portions are disposed laterally to overlap at the grass inlet such that fragments are prevented from being thrown out in a lateral direction due to a collision with the blade rotating at the grass inlet. a grass inlet formed at the front of the blade protection cover to ensure entry into the blade, wherein a height of the grass inlet is greater than a height of the blade, wherein the plurality of protrusion portions are disposed laterally to overlap at the grass inlet such that fragments are prevented from being thrown out in a lateral direction due to a collision with the blade rotating at the grass inlet.