Straight line volumetric filling equipment with weighing feedback was designed to solve the low precision problem. Straight line volumetric method was applied for filling; the volume cylinder was driven by high-precision servo motor, which ensured accurate motion displacement of the volume cylinder. The equivalent material was filled to feedback balance for weighing correction with the straight line volumetric filling; filling error was measured and corrected automatically in real time. The filling production line has high-precision of weighing filling and also the high-speed of volume filling line, which has good effects in practical application.