The invention relates to the technical field of environment-friendly decoration materials, and discloses an interior decoration partition wall which comprises a wall. A mounting component is inlaid inthe top of the front surface of the wall, a through slide groove with an arc-shaped top is formed in the middle of the bottom of the mounting component, a base plate, a connecting plate I, a connecting plate II and a tail plate are sequentially clamped with the mounting component via the slide groove from left to right, and positioning strips which are matched with the slide groove are fixedly connected with the tops of the base plate, the connecting plate I, the connecting plate II and the tail plate. The interior decoration partition wall has the advantages that positioning and slide effects can be realized by the slide groove and the positioning strips, the base plate, the connecting plate I, the connecting plate II and the tail plate can be conveniently clamped with the bottom of themounting component under limit effects of the slide groove, accordingly, the problem of high consumption of working hours due to the fact that partition walls need to be manually aligned and drawn together can be solved, large quantities of human and material resources can be saved, and the mounting convenience can be improved; errors in manual drawing procedures can be prevented, and the mountingprecision of the interior decoration partition wall can be improved.