A hedge trimmer includes a blade assembly including a first blade and a second blade, a motor including a motor shaft that is capable of rotating about a motor axis, a transmission device configured to transmit motion between the motor and the blade assembly, and a housing formed with a receiving cavity for receiving the motor and the transmission device. The motor drives the first blade and the second blade to move relative to the first blade. The transmission device includes a speed reduction assembly including a first gear for introducing motion output from the motor to the transmission device and an eccentric block assembly including an eccentric block. The eccentric block includes a first eccentric portion for cooperating with the first blade and a second eccentric portion for cooperating with the second blade.
