Wood block impurity separator and separation method thereof

The invention relates to a wood block impurity separator and a separation method thereof, and belongs to the field of waste wood processing. According to the wood block impurity separator, circular separation discs with crescent notches are mounted on driving roller shafts and driven roller shafts respectively, the driving roller shafts and the driven roller shafts are mounted on a rack, the circular separation discs form a conveying sieve tray, screening channels are formed between the driving roller shafts and the driven roller shafts and between the adjacent driven roller shafts, each chain transmission set is mounted on the driving roller shafts and the driven roller shafts at the same side, the driving roller shafts and the driven roller shafts are in linkage through the chain transmission effect, power devices are mounted at power input ends of the driving roller shafts, protective plates are mounted on the portions, at the left sides and the right sides of the driving roller shafts and the driven rolle