Abstract: A lawn edger includes an output shaft, a shield, a front housing, a rear housing, an electric motor, a connection assembly, and a transmission assembly. The output shaft is used for mounting a blade for cutting grass. The front housing accommodates at least part of the output shaft. The rear housing is formed with a coupling portion for coupling a battery pack. The electric motor is mounted in the rear housing to drive the output shaft. The connection assembly is used for connecting the front housing to the rear housing. The transmission assembly is used for transmitting power between the electric motor and the output shaft. When the electric motor is in a maximum-efficiency state, the ratio of output power of the electric motor to the weight of the lawn edger is greater than or equal to 180 W/kg.