A lawn mower robot, comprising: an outer cover; an inner body accommodated into the outer cover, and provided with a plurality of wheels for traveling on both sides thereof; a blade drive motor mounted inside the inner body; a rotating plate driven by the blade drive motor, and rotatably mounted on a bottom surface of the inner body; a plurality of blades rotatably mounted on the rotating plate, and unfolded to an outside of the rotating plate or folded to an inside of the rotating plate; a blade protection cover disposed on a bottom surface of the inner body to cover the rotating plate and the plurality of blades; a sealing portion configured to seal between the inner body and the blade protection cover; a lifting frame mounted with the blade drive motor therein, and liftably mounted in the inner body to adjust a height of the blade; and a mounting guide configured to mount the sealing portion on a bottom surface of the inner body, wherein the sealing portion comprises: a bellows-shaped corrugated portion configured to enable length adjustment in a vertical direction; an upper fastening portion fastened to a bottom surface of the inner body; and a lower surface portion connected to a bottom surface of the lifting frame and/or an upper surface of the blade protection cover, wherein the mounting guide comprises: a close contact portion to allow the upper fastening portion to be in close contact with the bottom surface of the inner body; and a shielding wall extended downward from the close contact portion to enclose the corrugated portion. an outer cover; an inner body accommodated into the outer cover, and provided with a plurality of wheels for traveling on both sides thereof; a blade drive motor mounted inside the inner body; a rotating plate driven by the blade drive motor, and rotatably mounted on a bottom surface of the inner body; a plurality of blades rotatably mounted on the rotating plate, and unfolded to an outside of the rotating plate or folded to an inside of the rotating plate; a blade protection cover disposed on a bottom surface of the inner body to cover the rotating plate and the plurality of blades; a sealing portion configured to seal between the inner body and the blade protection cover; a lifting frame mounted with the blade drive motor therein, and liftably mounted in the inner body to adjust a height of the blade; and a mounting guide configured to mount the sealing portion on a bottom surface of the inner body, wherein the sealing portion comprises: a bellows-shaped corrugated portion configured to enable length adjustment in a vertical direction; an upper fastening portion fastened to a bottom surface of the inner body; and a lower surface portion connected to a bottom surface of the lifting frame and/or an upper surface of the blade protection cover, wherein the mounting guide comprises: a close contact portion to allow the upper fastening portion to be in close contact with the bottom surface of the inner body; and a shielding wall extended downward from the close contact portion to enclose the corrugated portion. a bellows-shaped corrugated portion configured to enable length adjustment in a vertical direction; an upper fastening portion fastened to a bottom surface of the inner body; and a lower surface portion connected to a bottom surface of the lifting frame and/or an upper surface of the blade protection cover, wherein the mounting guide comprises: a close contact portion to allow the upper fastening portion to be in close contact with the bottom surface of the inner body; and a shielding wall extended downward from the close contact portion to enclose the corrugated portion. a close contact portion to allow the upper fastening portion to be in close contact with the bottom surface of the inner body; and a shielding wall extended downward from the close contact portion to enclose the corrugated portion.