A post for a combined light fitting includes a hollow post body composed of at least two post walls, a connector is installed in at least one end of the post body, the connector is provided with a screw connecting hole for connection with outside. All the post walls constituting the post are made of one piece of fiber plate, and on the surface of the fiber plate, at least one V-shaped groove extending along the direction of its height is formed, the V-shaped groove divides the fiber plate into several post walls, and the respective post wall is turned over inward along the V-shaped groove to form the hollow post. In addition, on the upper side and lower side of the fiber plate, positioning grooves are set along the direction of its width, the positioning grooves are perpendicular to the V-shaped groove, a connector is embedded in each of the two ends of the hollow post composed of various post walls after tuned over, and the base of the connector is embedded in the positioning groove for defining the position of the connector.