It is important to recycle CCA-treated wood waste safely from the viewpoint of efficient utilization of resources and environmental protection. For obtaining of the safe wood vinegar, we tested to remove arsenic from pyroligneous liquid obtained by pyrolysis of CCA-treated wood. Almost 99% of the arsenic could be removed from the pyroligneous liquid containing 80ppm arsenic, resulting in 1ppm of arsenic in the refined wood vinegar. The rectification system was shown to be very effective in removing arsenic from the pyroligneous liquid produced by pyrolysis of CCA-treated wood waste.