The invention discloses a power and free overhead conveyer for logistic orbital transfer weight sorting transportation. The conveyer comprises a high-speed chain rack, an overhead conveyer, a low-speed chain rack and a control system, wherein the high-speed chain rack is internally provided with a high-speed chain traction orbit below which a chain wheel device is arranged; a high-speed chain bearing orbit is arranged below the chain wheel device; the high-speed chain traction orbit is provided with a driving wheel on which a traction rod is arranged; the lower end of the traction rod is connected with a guide block arranged on the chain wheel device; two ends of the chain wheel device are provided with chain wheel driving systems; and each chain wheel driving system is internally provided with a load feedback jacking system. The power and free overhead conveyer has the advantages that a transportation trolley of the conveyer is of a lifting claw structure, the kinetic energy of the trolley is converted into potential energy during accumulation, and the potential energy of the trolley is converted into kinetic energy when the trolley is started, so that energy sources for trolley operation are saved.