The invention relates to a propeller hub, which comprises an oil cylinder body, a hub, a piston, a blade disc root, a sliding block, a guide frame, blade root bolts and a screw shaft provided with inner and outer oil pipes, wherein the oil cylinder body is connected with the hub; the piston is positioned in the oil cylinder body; the outer wall of the guide frame is in sliding connection with theinner edge of the central hole of the hub; and the hub is connected with the screw shaft through a flange blot. The propeller hub is characterized in that: the piston is arranged on the end of the guide frame inside the hub by a bolt; a chamber between the front end of the piston and the inner wall of the oil cylinder body is a front chamber; a chamber enclosed by the piston, the inner cavity of the guide frame and the end part of the screw shaft inserted into the inner cavity of the guide frame is a rear chamber; the sliding block is arranged in a chute arranged on the outer wall of the guide frame; the root part of the blade disk root is provided with a pin which is inserted into the sliding block and is in movable connection with the sliding block; the outer oil pipe in the screw shaftis communicated with the rear chamber; the inner oil pipe passes through the rear chamber and the piston to be communicated with the front chamber; and the blade disc root is provided with blade rootblots for fixing blade roots, the front ends of the blade root bolts incline toward blade axes, and the elongation lines of the front ends of the blade root bolts form 5 to 15 degree angle with the blade axes.