A fixture apparatus for vehicle air-conditioner vent outlet is provided, including a fixing unit, a dial, a traction element, a clamp and a support element. The fixing unit is installed with the dial and limits the dial to only rotate at location. The clamp includes two coupled clips. The traction element is disposed with outer screw thread at some segment extending into the fixing unit and contacts the dial in a screw-like manner. When the dial rotates, the traction element moves linearly. One end of traction element outside of the fixing unit is coupled to the coupling position of the two clips of the clamp. The support element is coupled to outer wall of fixing unit, located on a same side of the clamp.