Novel volumetric flask washing brush

The utility model discloses a novel volumetric flask washing brush in the technical field of volumetric flask washing devices, which comprises a bottle body and an insertion tube positioned in the bottle body, a bearing is mounted at the bottom end in the insertion tube, a screw rod is rotatably connected onto the bearing, a driving rod is fixedly arranged at the top end of the screw rod, and a brush rod is fixedly arranged at the bottom end of the driving rod. The other end of the driving rod movably penetrates through the inserting pipe and is connected with an anti-skid end part, two openings which are in bilateral symmetry are formed in the outer surface of the lower end of the inserting pipe, connecting plates are hinged to the bottom ends of the outer sides in the openings, and an opening and closing assembly is jointly connected between the two connecting plates; the volumetric flask washing brush is simple and convenient to operate, and can solve the problems that although a common volumetric flask wa