High-power large-size controllable-pitch propeller hub

The invention relates to a high-power large-size controllable-pitch propeller hub. One end of a propeller hub body is fixedly connected with a propeller shaft, and the other end of the propeller hub body is fixedly connected with a servo oil cylinder. A front end shaft of a piston rod guide frame is arranged in a propeller shaft hole neck bush, a rear end shaft penetrates through a propeller hub body rear end hole to be fixedly connected with a piston, and each side face of an outer polygonal boss in the middle of the piston rod guide frame is provided with a sliding groove. Sliding blocks arearranged in the sliding grooves, sliding block inner holes are cooperatively connected with crank pins of crank discs, and the crank discs are connected with blade root flanges through blade root bolts. Intra-shaft double oil pipes are sleeved with the piston rod guide frame, the inner oil pipe communicates with a rear cavity, the outer oil pipe communicates with a front cavity, when high-pressure oil is conveyed into th