An unmanned lawn mower includes a mower body, a cutting module, a wheel module, a camera module and a CPU. The cutting module is mounted on the mower body and configured to weed. The wheel module is mounted on the mower body and configured to move the mower body. The camera module is mounted on the mower body and configured to capture images of surroundings of the mower body. The CPU is coupled to the cutting module, the wheel module and the camera module. The central processing unit controls the cutting module and the wheel module to weed within an area according to the images captured by the camera module and control signals from a handheld electronic device, or the central processing unit controls the cutting module and the wheel module to weed within the area according to the images captured by the camera module.
