A waist connection apparatus for an artificial model comprises an upper and a lower bases respectively, and an upper and a lower engaging disks respectively. The upper and the lower engaging disks are fastened to the upper and the lower bases respectively. The upper and the lower disks provide detachable connecting parts such that the upper and the lower parts of the model can be joined together or separated apart easily. Hence, the waist connection apparatus makes the model possible to be hung up, lean to one side, and many other postures as desired by the need of exhibition. Furthermore, the waist connection apparatus can fit any size of the model as soon as a proper sized waist connection apparatus is replaced.