Pipette brush suitable for fat-belly pipette

The utility model relates to a transfer pipette brush suitable for a fat-belly transfer pipette, which comprises a sleeve shell provided with an inner cavity and a brush rod axially penetrating into the inner cavity of the sleeve shell, bristles are fixedly arranged at the part of the brush rod positioned in the sleeve shell, a plurality of through holes for the bristles to penetrate through are arranged on the side wall of the sleeve shell, and the outer diameter of the sleeve shell is smaller than the inner diameter of the transfer pipette. According to the utility model, through the relative movement of the sleeve shell and the brush rod, the bristles are inclined, and the diameter of the circle where the outer ends of the bristles are located is reduced, so that the requirement of entering the pipette is met, the inner wall of the thinner position of the pipette is prevented from being scratched, and when the bristles reach the expansion position of the pipette, the bristles can be conveniently cleaned th