Quantitative proportioning device for cement concrete

The utility model discloses a cement concrete quantitative proportioning device which comprises a mixing box, a blanking recycling box and a blanking port, the blanking recycling box is fixed at the top end of the mixing box, a material distributing box is fixed at the top end of the blanking recycling box, a feeding port used for feeding is fixed at the top end of the material distributing box, and the blanking port is fixed at the top end of the mixing box. A discharging opening for discharging is formed in the bottom end of the mixing box; and a rotating shaft is rotationally connected to the interior of the material distribution box through a bearing. A rotary component structure is adopted, sufficient raw materials are added into the feeding port, the raw materials enter the position between the two partition pieces, the rotating shaft rotates to drive the two partition pieces to rotate for discharging, the discharging amount is controlled by controlling the rotating times of the partition pieces, redund