The invention discloses a quantitative material conveying device for a pearl packaging production line and belongs to the technical field of material conveying. The quantitative material conveying device comprises a rack, a control system, an extending-and-contracting air cylinder, a slide block, a rotating shaft, a rotating vane, a discharging pipe, an arc-shaped quantitative pipe, a spiral material conveying pipe and a material box. The control system is mounted at the right side of the rack. The rotating shaft is connected to the upper end of the control system. The rotating vane is connected to the upper end of the rotating shaft and matched with an open groove of the arc-shaped quantitative pipe. The lower end of the arc-shaped quantitative pipe is connected with the upper end of thedischarging pipe. The upper end of the arc-shaped quantitative pipe is connected with the lower end of the spiral material conveying pipe. The upper end of the spiral material conveying pipe is connected with the material box. The extending-and-contracting air cylinder is arranged at the left side of the rack. The slide block is arranged at the upper end of the extending-and-contracting air cylinder. An oil inlet pipe and an oil outlet pipe are arranged at the right side of the extending-and-contracting air cylinder and connected with the control system. The quantitative material conveying device has the beneficial effects of being reasonable in structure, precise in quantification, fast and convenient in material conveying, small in occupied area and applicable to the production line.