A movable wood crushing machine according to the present invention comprises a vehicle body 2 with a travel device provided therein; a rotary crushing device 6 provided at an edge of this vehicle body in the traveling direction for crushing the wood into wood chips; a tab-type feeder 7 provided on this rotary crushing device with an charging opening for charging wood to be crushed formed in an upper section thereof; a conveyer 4 extending from a position under the rotary crushing device 6 in the traveling direction of the vehicle body toward the other edge section of the vehicle body in the traveling direction for transferring and discharging wood chips crushed by the rotary crushing device 6 to the outside; and a drive unit 5 provided between the rotary crushing device 6 and the conveyer 4 for driving drive sources for the travel device 3, the rotary crushing device 6, the tab-type feeder 7, and the conveyer 4.