Material grading crushing device

The invention relates to the technical field of material crushing, in particular to a material grading crushing device which comprises a rack, a crushing assembly, a quantitative feeding assembly and the like. The crushing assembly is installed on the rack and comprises a crushing cylinder installed on the rack, crushing rollers matched with crushing teeth on the inner wall of the crushing cylinder in a staggered mode are rotationally arranged in the crushing cylinder, and a crushing motor which drives the crushing rollers to rotate to be matched with the crushing teeth on the inner wall of the crushing cylinder so as to crush materials in the crushing cylinder is arranged on the crushing cylinder. And the quantitative feeding assembly comprises an arc-shaped block, a quantitative plate and a driving motor, and the quantitative plate is rotationally connected into the crushing barrel. Materials entering through the feeding opening of the crushing barrel are blocked in the inner cavity of the upper portion of