The invention discloses a quantitative feeding device for agricultural breeding, and relates to the technical field of agricultural breeding. The quantitative feeding device mainly aims at solving theproblem that in existing agricultural breeding, the feeding amount is difficult to control by manually adding feed. The quantitative feeding device comprises a bottom plate, a trough and a feeding unit, wherein the trough is fixedly installed on the upper surface of the bottom plate; the feeding unit comprises a material cylinder, partition plates and a driving mechanism for driving the partitionplates to rotate; the driving mechanism comprises a standing plate, a spring, an arc-shaped rack, a single-stage flywheel, a bevel gear pair, a worm and a worm gear; and air bags for adjusting the volume are installed on the two side walls of each partition plate. The feeding unit is arranged, quantitative feeding is achieved through the weight of livestock, the automation degree is high, and thebreeding effect is good; and the air bags are arranged, the purpose of adjusting the volume of the space between the adjacent partition plates is achieved by adjusting the size of the air bags, and therefore the feeding amount is adjusted to meet the breeding requirements in different periods.