Lifting power arm for elevator installation construction

The utility model relates to the technical field of building equipment, and discloses a lifting power arm for elevator installation construction, which comprises a base, the top of the base is rotatably connected with a rotary lower support, the middle of the top end of the rotary lower support is rotatably connected with a rotary bearing, the top of the rotary bearing is rotatably connected with a rotary upper support, and the rotary upper support is rotatably connected with a lifting device. And the left side of the top of the rotary upper support is in threaded connection with a fixing plate, the middle of the top end of the fixing plate is fixedly connected with a first lifting mechanism, and the left side of the middle of the top end of the fixing plate is fixedly connected with a large arm lifting mechanism. In the utility model, during construction, the cargo boom of the device adopts a movable arm form and is driven by a motor to operate, the rotation radius can be randomly adjusted as required, the c