The invention discloses a vehicle top luggage support arranged on the top of a vehicle. A trunk is arranged inside the luggage support; the luggage support is composed of two parallel support bodies; fixing rods are arranged at the two ends of the two support bodies and between the two support bodies; parallel guide rails are arranged on the top of the vehicle; pulley blocks are arranged at the two ends of the outer sides of the support bodies and clamped into the guide rails; the guide rails are internally provided with a moving device for driving the luggage support to move; supporting rods are vertically and upwards arranged at the two ends of the support bodies; sheaves are arranged at the end portions of the supporting rods; positioning rods are vertically arranged at the positions, corresponding to the sheaves, of the two sides of the trunk; wire ropes penetrate through the positioning rods; the end portions of the wire ropes are fixed with wire rope clamps; the support bodies are provided with lifting devices; the wire ropes wind across the sheaves to be connected with the lifting devices; and the lifting devices drive the wire ropes to ascend or descend, so that ascending or descending of the trunk is facilitated.