Complementary container neck and configuration method thereof

The invention relates to a complementary container neck and a configuration method of the complementary container neck. The neck arranged on a container can be jointed with a cover used for covering the neck, and the neck comprises a tubular body. One open end of the tubular body is provided with an annular top surface; threads are arranged along the outer portion column face of the tubular body, are provided with cylinder root diameters and are used for being matched with corresponding threads on a shell of the cover to enable the cover to be spirally fixed to the neck. An annular ladder is limited on the outer portion of the tubular body, is directly located below the annular top surface and above the threads, is provided with the cylinder sealing diameter and is used for being jointed with an outer sealing ring hanging down from a top plate of the cover in a sealing manner. The sealing diameter is smaller than the cylinder root diameter, and the difference value between the sealing diameter and the cylinder root diameter exceeds 0.1 mm. According to the configuration, bottle necks suitable for cold and heat filling can use the same cover, and materials can be saved.