Metering precision device for additive

The utility model relates to a metering precision device for additives. Wherein the weighing cylinder is connected to the fixing frame in a sliding mode in the vertical direction and can conduct feeding and discharging, the weighing device is arranged on the fixing frame and can weigh materials in the weighing cylinder, and the cleaning device is arranged on the weighing cylinder and cleans the interior of the weighing cylinder. The cleaning device comprises a cleaning nozzle which is rotatably connected to the horizontal inner wall of the top of the weighing cylinder, and a rotating mechanismwhich is arranged on the weighing cylinder and drives the cleaning nozzle to rotate. And the cleaning spray head faces the joint of the top and the vertical inner wall of the weighing cylinder, so that the residual additive solution can be cleaned and removed after weighing is completed, and the effect that the normal effect of the additive cannot be influenced due to the fact that a large amountof other additives are mi