This invention relates to steam re-compression vacuum dryers used for dehydrating
and drying water-containing wastes, such as rubbish, waste fish, mud, etc. and also used for concentrating liquid wastes. More particularly, the present invention relates to a steam re-compression vacuum dryer, which comprises a vacuum tank for accommodating a waste, a compressing means for compressing steam from the vacuum tank, a steam condensing means thermally coupled thereto, and exhausting means for exhausting condensation water and non-condensing gas.