Stair handrail aluminum die-casting corner

The utility model discloses a stair handrail aluminum die-casting corner which comprises a main body module and a supporting module, and the main body module comprises a central pipe and two butt joint mechanisms arranged at the two ends of the central pipe respectively. The supporting module comprises a mounting plate located below the center pipe, a jacking block connected to the outer surface of the center pipe, a translation mechanism arranged at the top of the mounting plate, two connecting mechanisms arranged between the translation mechanism and the interior of the jacking block, and two locking mechanisms arranged between the translation mechanism and the top of the mounting plate. A translation block is pushed to slide on the outer surface of a sliding rod to drive a U-shaped block to move, the U-shaped block pushes a connecting sleeve rod through a first rotating shaft, and the connecting sleeve rod drives a jacking block to ascend or descend through a second rotating shaft, so that the height of a