The invention discloses a constant-speed universal hinged propeller hub for a tilt-rotor aircraft, which comprises a propeller hub head and a torque transmission part connected with the propeller hub head, wherein, a ball cage hinge is taken as the torque transmission part. By adopting the structure, the constant-speed universal hinged propeller hub has the advantages of reduced size, compact structure, small speed fluctuation, great transfer torque and fewer parts, thus being easy to be used on the small-sized tilt-rotor aircraft.