The invention discloses a quantitative plate supply machine. The quantitative plate supply machine comprises a supply device, and a cutting device mounted on the side surface of the supply device; thesupply device comprises a frame, a placing table, a hoisting mechanism and a pushing mechanism; the placing table is used for placing plates to be cut; the placing table is slidingly connected with the frame; the hoisting mechanism is mounted on the frame, and is suitable for driving the placing table to perform a reciprocating motion in the height direction of the frame; and the pushing mechanism is arranged above the placing table. The quantitative plate supply machine can cut raw plates into small blocks, so that the blockage of a crushing mechanism during crushing is prevented, and meanwhile, the influence on subsequent production by larger particle sizes of the crushed plates is prevented; and in addition, no worker is needed to carry the raw plates to the crushing mechanism for crushing, so that the working efficiency is high, and the labor cost is reduced.