The present disclosure relates to a lawn mower robot, and the lawn mower robot may include an outer cover (100)； an inner body (120) accommodated into the outer cover to mount a plurality of wheels (109) for traveling on both sides thereof； a plurality of wheel drive motors mounted on both sides of the inner body, respectively, to drive the plurality of wheels, respectively； a rotating plate (112) rotatably mounted on a bottom surface of the inner body； a plurality of blades (111) rotatably mounted on the rotating plate to mow the grass； a blade drive motor (113) mounted inside the inner body to rotate a plurality of blades together with the rotating plate； a battery (130) mounted inside the inner body to supply power to the wheel drive motor and the blade drive motor； a battery receiving portion (131) extended upward in a protruding manner from a bottom surface of the inner body toward an inner space of the inner body to accommodate the battery therein at the bottom surface of the inner body； and a battery cover (132) mounted to cover a lower portion of the battery receiving portion, thereby improving convenience of assembly.
