The invention relates to the technical field of quantitative material stacking mechanisms, in particular to a rotary quantitative material stacking system. The rotary quantitative material stacking system comprises a stand, groove type hoppers, elastic force sensors, a motor and a controller used for driving the motor to rotate, the motor is arranged at the axle center in the stand, the output end of the motor runs through a workbench of the stand to connect with a rotating shaft arranged at the axle center of the top of the workbench, the controller is arranged at one side of the motor, a turn plate is arranged at the top of the rotating shaft, the hoppers are suspended on the turn plate by the elastic force sensors, a plurality of hoppers are uniformly distributed along the circumferential direction of the turn plate, a feed hole is formed in the side wall of the upper part of each hopper, an electric discharge gate controlled by the controller is arranged at the bottom end of each hopper, and the elastic force sensors are connected with the controller. The rotary quantitative material stacking system automatically controls ordered material stacking, the material stacking quality is good, the efficiency is high, the structure is simple, and the cost is low.