A hedge trimmer comprising: a trimming blade, extending along a longitudinal axis, configured for carrying out a reciprocating motion; a first housing, being formed or connected with a first handle, having a first locking portion; a second housing, being formed or connected with a second handle, and rotatable with respect to the first handle around a rotation axis, wherein a plane perpendicular to the rotation axis is obliquely intersected with a plane perpendicular to the longitudinal axis of the trimming blade; a transmission mechanism, being combined to the first housing, for driving the trimming blade; an electric motor, being combined to the first housing, for driving the transmission mechanism; a battery pack, being combined to the second housing,for supplying the electric motor with electric power; a trigger configured for controlling the electric motor; and a control member, being movably connected to the first housing or the second housing, comprising a second locking portion cooperable with the first locking portion; wherein the control member has a first position and a second position with respect to the second housing whereby, when the control member is at the first position, the first locking portion and the second locking portion are engaged with each other and the first housing and the second housing are relatively fixed, and, when the control member is at the second position, the first locking portion and the second locking portion are disengaged with each other, and the second housing is allowed to rotate with respect to the first housing around the rotation axis, wherein the second housing has a first rotation position and a second rotation position with respect to the first housing and, when the second housing is rotated to the first rotation position, a plane in which a longitudinal axis of the second handle locates is parallel to the longitudinal axis of the trimming blade and, when the second housing is rotated to the second rotation position, the second handle is rotated 90 degrees with respect to the first rotation position; wherein, when the second housing is rotated to the second rotation position, the second handle and the battery pack are located at two sides of a plane defined by intersection of an axis of the electric motor with the longitudinal axis of the trimming blade; characterized in that: the control member comprises a stopper portion and, when the control member is at the second position, the stopper portion stops movement of the trigger. a trimming blade, extending along a longitudinal axis, configured for carrying out a reciprocating motion; a first housing, being formed or connected with a first handle, having a first locking portion; a second housing, being formed or connected with a second handle, and rotatable with respect to the first handle around a rotation axis, wherein a plane perpendicular to the rotation axis is obliquely intersected with a plane perpendicular to the longitudinal axis of the trimming blade; a transmission mechanism, being combined to the first housing, for driving the trimming blade; an electric motor, being combined to the first housing, for driving the transmission mechanism; a battery pack, being combined to the second housing,for supplying the electric motor with electric power; a trigger configured for controlling the electric motor; and a control member, being movably connected to the first housing or the second housing, comprising a second locking portion cooperable with the first locking portion; wherein the control member has a first position and a second position with respect to the second housing whereby, when the control member is at the first position, the first locking portion and the second locking portion are engaged with each other and the first housing and the second housing are relatively fixed, and, when the control member is at the second position, the first locking portion and the second locking portion are disengaged with each other, and the second housing is allowed to rotate with respect to the first housing around the rotation axis, wherein the second housing has a first rotation position and a second rotation position with respect to the first housing and, when the second housing is rotated to the first rotation position, a plane in which a longitudinal axis of the second handle locates is parallel to the longitudinal axis of the trimming blade and, when the second housing is rotated to the second rotation position, the second handle is rotated 90 degrees with respect to the first rotation position; wherein, when the second housing is rotated to the second rotation position, the second handle and the battery pack are located at two sides of a plane defined by intersection of an axis of the electric motor with the longitudinal axis of the trimming blade; characterized in that: the control member comprises a stopper portion and, when the control member is at the second position, the stopper portion stops movement of the trigger.