The invention relates to a circuit board crushing separation mechanism, and belongs to the technical field of separation. The circuit board crushing separation mechanism comprises a support of a frametype structure. An obliquely formed chute with the left portion being high and the right portion being low is hinged to the support, a vibrating assembly is installed at the lower right end of the chute, a plurality of filtering holes used for discharging small particle materials are formed in the chute bottom of the chute, and discharging ports used for discharging large particle materials are formed in the positions, at the lower right ends of the filtering holes, of the chute bottom of the chute; a small particle recovery channel used for receiving the materials is formed below the filtering holes, a large particle recovery channel is formed below the discharging ports, and discharging blocks used for plug cleaning are arranged to correspond to the filtering holes; and each dischargingblock is installed on a foldable plate capable of being folded, the foldable plates are hinged to the support, and a baffle is arranged at the lower right end of the chute. Through the separation process of the design, the materials with the particle size being small are collected, meanwhile the large particle materials are recovered and then crushed again, both time and labor are saved in the using process, and the materials are further convenient to clean after separation is conducted.