Quantitative dosing device for water treatment

The utility model relates to the technical field of water treatment, and discloses a quantitative dosing device for water treatment, which comprises a treatment tank, one end of the inner wall of the treatment tank is fixedly connected with a cleaning plate, the top end of the cleaning plate is slidably connected with an adapter, and one end of the adapter is fixedly connected with a second electric pull rod. A brush plate is fixedly connected to the bottom end of the second electric pull rod, a plurality of brushes are arranged at the bottom end of the brush plate, and a motor is fixedly connected to one end in the treatment tank. Through linkage of the threaded rod, the motor, the cleaning plate, the adapter, the sliding part, the second electric pull rod, the brush plate, bristles and the like, the motor drives the threaded rod to control the sliding part to slide, and the second electric pull rod drives the brush plate to the bottom of the treatment tank, so that a brush arranged at the bottom end of the