The invention belongs to the field of wood processing equipment, and particularly relates to a waste processing device for a wood pulverizer. The waste processing device for the wood pulverizer achieves the technical purposes that wood waste can be conveniently cleaned away, wood bits in the wood waste can be restrained from flying, time and labor are saved during wood waste processing, the efficiency is high, and waste is thoroughly processed. The waste processing device for the wood pulverizer comprises a bottom frame, a driving mechanism, a feeding hopper, a pulverizing box, a support, a smashing mechanism, a waste processing device and a first discharging pipe; the driving mechanism is installed at the top of the bottom frame, the pulverizing box is fixedly connected to the top of thebottom frame through the support, the smashing mechanism is installed inside the driving mechanism, and the smashing mechanism is in transmission connection with the output end of the driving mechanism. The device achieves the effects that wood waste can be conveniently cleaned away, wood bits in the wood waste can be restrained from flying, time and labor are saved during wood waste processing, the efficiency is high, and waste is thoroughly processed.