The invention relates to a preparation method of a seamless high-pressure
gas cylinder. The preparation method comprises the following steps of 1, preparing a blank; 2, extruding the blank reversely to
machine a rough tube blank; 3, carrying out precision
forging and
tube drawing to form a precision
forging tube blank; 4, carrying out heat treatment on the precision
forging tube blank; 5, carryingout
spinning to prepare a tube, reducting the thickness of the tube blank subjected to precision forging to a required thickness by thickness reduction
spinning equipment, forming the tube, and preparing annular reinforcing ribs integrally formed with the tube on the inner wall of the tube through
spinning; and 6, sealing the opening by hot spinning, and preparing the
gas cylinder. The inventionfurther relates to the seamless high-pressure
gas cylinder prepared by the method, the inner wall of the gas cylinder is provided with the integrally-formed annular reinforcing ribs, so that the pressure-
bearing capacity of the tube is improved, and the tube is attractive in appearance and easy to install; and materials are saved, the cost is low.