High-precision feeding and conveying control system

The invention discloses a high-precision feeding and conveying control system which comprises an opening and closing control valve, a high-precision flow meter and an active constant volume device, the active constant volume device comprises a calibration container and a temporary storage container, and a liquid level measuring device is arranged in the calibration container; the calibration container is communicated with the temporary storage container through a first transfer pipeline, and a liquid-phase reactant in the calibration container is transferred into the reaction kettle through a second transfer pipeline. According to the method, the active constant volume device is used for constant volume to determine the opportunity of starting to add the liquid phase reactant into the reaction kettle, and compared with a traditional method, the liquid level height in the calibration container is recorded in real time, then adjustment is continued after the valve is closed by taking the recorded liquid level h