<p>The present invention relates to a sea squirt byproduct treating device for reducing a volume by compressing and pulverizing a sea squirt byproduct. The device comprises: a housing opened to have a penetrated inside and having a feeding hopper for feeding a sea squirt byproduct from the outside; a compressing screw disposed in the housing and transferring or compressing a fed sea squirt byproduct; and a pulverizing unit for pulverizing the sea squirt byproduct transferred or compressed from the compressing screw. Various sea squirt byproducts including shells which contain water and are slippery and hard are pulverized, thereby reducing a volume.</p>
