The invention discloses a changeable wall hanging support for a flat-panel television, comprising a bottom plate, a rotation arm, a support assembly and a wall hanging plate, wherein the bottom plate is fixed on a wall; the wall hanging plate is used for fixing the flat-panel television and hung on the support assembly; the rotation arm is divided into two parts which respectively are a first rotation arm region and a second rotation arm region; the first rotation arm region turns a corner and then extends to the second rotation arm region; the first rotation arm region is pivoted at one sideof the bottom plate; the second rotation arm region is pivoted at the support assembly; the vertical distance between the outer surface of the first rotation region and the outer surface of the second rotation region is smaller than or equal to the depth of the bottom plate; and under the shrinkage state of the rotation arm, the first rotation arm region is tightly attached to the outer surface of the bottom plate, and the support assembly is tightly attached to the second rotation arm region. The changeable wall hanging support has the advantages that after the rotation arm turns a corner, the support assembly is directly attached to the second rotation arm region; and after the flat-panel television is installed on the support, the distance between the flat-panel television and the wallis saved, and the saved distance is the vertical distance between the outer surface of the first rotation arm region and the outer surface of the second rotation region.