The utility model relates to a printed packaging technical field, concretely relates to cardboard printing dust collector. This cardboard printing dust collector is including installing at the paper conveying roller, and paper conveying roller top is provided with convulsions dust removal case and brush, and convulsions dust removal case both sides are provided with the pneumatic cylinder of being connected with convulsions dust removal case, and the cylinder body of pneumatic cylinder is fixed in the printing frame, and the movable rod is connected with convulsions dust removal case, convulsions dust removal case passes through air suction hose and suction fan and dust removal union coupling, and the dust removal union coupling has the sack cleaner. The utility model provides a current dust collecting equipment brush is changed inconveniently and is removed dust not thorough problem. The top both sides of printing frame are provided with the pneumatic cylinder to driving convulsions dust removal case and doing the oscilaltion campaign, the convenience is changed the brush. Dirty gas carries out gas purification treatment through the pipe suction sack cleaner that removes dust, and it is thorough to remove dust. Air after the purification is discharged through the air outlet, has realized no pollutant discharge, has protected the environment.