The present invention provides a power-driven hedge trimmer with a movable power assembly. The power-driven hedge trimmer includes: a power and trimming assembly, a gripping assembly and a control unit. The power and trimming assembly includes a trimming blade and a power source. The trimming blade is connected to the power source so as to be driven to reciprocate. The gripping assembly includes a front gripping portion, a connecting portion and a rear gripping portion. The control unit is disposed on the connecting portion for controlling the power source. The front attaching portion and the rear attaching portion are two rotary shafts. A rear stop lock is disposed on the rear gripping portion for locking the front attaching portion and the rear attaching portion at fixed locations.
