Abstract: A partition wall comprising a plurality of partition wall units each of which includes two extruded hollow aluminum columns, two extruded hollow aluminum beams, and four plastic joints; a plurality of resilient snap elements; a plurality of holding bars; and a plurality of sets of locking members, characterized in that the joint comprises a vertical portion and a horizontal portion perpendicular to each other, so that the column and the beam are connected to each other by inserting the vertical portion and the horizontal portion into the column and the beam respectively; and in that the wall units are connected by means of grooves and/or tongues provides on the columns and beams, a plurality of holding bars, and a plurality of sets of locking members.