Metal pipeline surface polishing device applied to building construction

The invention discloses a metal pipeline surface polishing device applied to building construction. The outer side of a steel pipe is uniformly provided with air holes; an air blower is arranged at the outer side of a box body; an air outlet of the air blower communicates with the steel pipe; the two internal sides of the box body are each provided with an air sucking mechanism; the left and rightsides of the bottom of the box body are correspondingly provided with supporting legs; the bottom of each supporting leg is welded to the top of a base plate; the left and right sides of the top of the base plate are correspondingly provided with supporting columns; the tops of the supporting columns are connected with a top plate; according to the metal pipeline surface polishing device, a firsthydraulic cylinder is used for driving rolling wheels to clamp a metal pipe so that the metal pipe is not likely to shake, thus a grinding wheel can be used for quickly polishing the metal pipe; according to the metal pipelin