Makeup brush bristle trimming device

The utility model discloses a bristle trimming device of a cosmetic brush. Including a support frame, a conveying belt arranged in the left-right direction is arranged at the upper end of the supporting frame; conveyor belt is a chain plate type conveyor belt, the conveying belt is driven by a first driving motor arranged on the supporting frame; a plurality of clamping mechanisms are evenly distributed on the outer side face of the conveying belt in the circumferential direction. A trimming chamber is arranged below the conveying belt; the trimming chamber is fixedly arranged on the supporting frame. The upper and lower ends of the trimming chamber are opened; notches are formed in left and right sides of the upper end of the trimming chamber; the notch extends upwards to the uppermost end of the trimming chamber; a support is arranged at the lower end in the trimming chamber, a second driving motor is arranged at the upper end of the support, a power output shaft of the second driving motor is arranged in t