The present invention provides a ship radial waste-gas turbo supercharger adjustable nozzle blades and nozzle ring. It is characterized by that several nozzle blades and nozzle ring can be separately arranged, the shaft of nozzle blades can be rotatably passed through the hole of nozzle ring, one end portion of shaft is connected with a gear, several described gears are meshed with a geared ring. Said mechanism also includes an element capable of making said geared ring be rotate. Besides, said invention also provides the working principle of said nozzle ring mechanism.