Axial anti-loosening structure of high-speed rotating part

The utility model relates to the technical field of part fastening, in particular to a high-speed rotating part axial anti-loosening structure which comprises a high-speed rotating shaft, a round nut and a tightening screw. The high-speed rotating shaft has steps and slopes; the round nut is in threaded connection with the high-speed rotating shaft and located on the side of the high-speed rotating shaft; the tightening screw is in threaded connection with the round nut and located on the side edge of the round nut. A part needing to be prevented from loosening is placed on the side edge of the high-speed rotating shaft, the round nut is screwed on the high-speed rotating shaft, and the part can be limited and fixed through the round nut and the steps on the high-speed rotating shaft; by screwing the tightening screw into the round nut and enabling the tightening screw to abut against the inclined face on the high-speed rotating shaft, when the round nut gets loose during high-speed rotation and gets away fro