Noise reduction device of high-rotating-speed brushless motor

The invention discloses a noise reduction device of a high-rotating-speed brushless motor. The noise reduction device comprises an outer shell, a power device, a noise reduction device body and a damping device, wherein the noise reduction device body comprises a first partition plate, fan-shaped holes, a silencing cylinder, sound absorption balls, dispersion holes and a retarding device, the right side of the outer shell is fixedly connected with the first partition plate, the six fan-shaped holes which are distributed at equal intervals in the axial direction are formed in the first partition plate, the silencing barrel is fixedly connected to the right side of the first partition plate, the plurality of sound absorption balls which are evenly distributed are fixedly connected to the axial inner side wall of the silencing barrel, and the plurality of dispersion holes which are evenly distributed are formed in the axial side wall of the silencing barrel. According to the noise reduction device of the high-ro