Disclosed in the present invention is a double-pack lithium electric lawn mower comprising a DC motor for driving a cutting blade, wherein the DC motor is connected with a control system, and the control system is connected with a power supply; the power supply is a lithium battery pack, and the DC motor is connected with the lithium battery pack through the control system; the lithium battery pack power supply drives the DC motor through the control system, in order to drive the cutting blade to cut grass; the lithium battery pack comprises two serially connected lithium battery packs, and the control system achieves a soft start function under the control of a microcontroller U3; at a standby state or a light load state, the output duty ratio is controlled to 80%, at this time, the rotating speed of the blade can be maintained at about 2800 rpm, and when the load is increased, the output duty ratio is maximized to continue to maintain the rotating speed, thereby both meeting the application requirements and saving energy, meanwhile, greatly reducing the noise. According to the double-pack lithium electric lawn mower disclosed by the present invention, the power supply of the control system is transmitted by a sensitive switch, and the sensitive switch is at a turned off state at a standing aside state, thus ensuring the zero power consumption of standby on hardware.