A robotic lawn mower, comprising: a mowing system for mowing grass; a housing configured to support the mowing system; a working assembly comprising a working wheel configured to support the housing to drive the robotic lawn mower to walk on a ground; and an energy source device used to provide energy source; wherein the mowing system comprises: a cutting assembly comprising a mowing member for cutting the grass and a mounting shaft for mounting the mowing member, wherein the mounting shaft is capable of rotating about a first axis relative to the housing; a driving mechanism comprising an electric motor, the electric motor comprising a stator assembly and a rotor assembly, the rotor assembly comprising a driving shaft for driving the cutting assembly to rotate; and a height adjusting mechanism for adjusting the movement of the cutting assembly along the first axis to achieve different cutting heights of the mowing member, characterized in that the driving shaft is provided with a mounting hole and the mounting shaft passes through the mounting hole; the driving shaft is formed with a driving portion for driving the mounting shaft to rotate synchronously with the driving shaft and the driving portion allows the mounting shaft to move relative to the driving shaft along the first axis; and when the height adjusting mechanism adjusts the cutting assembly to move along the first axis, the mounting shaft moves relative to the driving shaft along the first axis. a mowing system for mowing grass; a housing configured to support the mowing system; a working assembly comprising a working wheel configured to support the housing to drive the robotic lawn mower to walk on a ground; and an energy source device used to provide energy source; wherein the mowing system comprises: a cutting assembly comprising a mowing member for cutting the grass and a mounting shaft for mounting the mowing member, wherein the mounting shaft is capable of rotating about a first axis relative to the housing; a driving mechanism comprising an electric motor, the electric motor comprising a stator assembly and a rotor assembly, the rotor assembly comprising a driving shaft for driving the cutting assembly to rotate; and a height adjusting mechanism for adjusting the movement of the cutting assembly along the first axis to achieve different cutting heights of the mowing member, characterized in that the driving shaft is provided with a mounting hole and the mounting shaft passes through the mounting hole; the driving shaft is formed with a driving portion for driving the mounting shaft to rotate synchronously with the driving shaft and the driving portion allows the mounting shaft to move relative to the driving shaft along the first axis; and when the height adjusting mechanism adjusts the cutting assembly to move along the first axis, the mounting shaft moves relative to the driving shaft along the first axis. a cutting assembly comprising a mowing member for cutting the grass and a mounting shaft for mounting the mowing member, wherein the mounting shaft is capable of rotating about a first axis relative to the housing; a driving mechanism comprising an electric motor, the electric motor comprising a stator assembly and a rotor assembly, the rotor assembly comprising a driving shaft for driving the cutting assembly to rotate; and a height adjusting mechanism for adjusting the movement of the cutting assembly along the first axis to achieve different cutting heights of the mowing member, characterized in that the driving shaft is provided with a mounting hole and the mounting shaft passes through the mounting hole; the driving shaft is formed with a driving portion for driving the mounting shaft to rotate synchronously with the driving shaft and the driving portion allows the mounting shaft to move relative to the driving shaft along the first axis; and when the height adjusting mechanism adjusts the cutting assembly to move along the first axis, the mounting shaft moves relative to the driving shaft along the first axis.