The invention belongs to composite forming technology, and relates to an integrated forming method for a large-length-diameter-ratio composite tubular member. By combining a core mould with an integrated female mould for forming, the integrated forming method comprises the following steps: I. manufacturing the core mould; II. manufacturing the female mould; III. integrally laying up on the core mould; IV. installing the integrated female mould outside the layup; V. sealing a vacuum bag, and curing forming; VI. respectively stripping the female mould and the core mould. The manufacturing of the female mould in the step II refers to the completion of forming and manufacturing of the female mould on the core mould, and the female mould is made of tubular soft rubber materials. Compared with the simple female mould forming, the integrated forming method is more convenient and simple, and meets the requirement of integrated layup; compared with the traditional core mould forming method, the problem that the quality of the outer surface is bad can be avoided, the quality requirement on the outer surface of the tubular parts can be ensured, the surface of an inner cavity is smooth in quality and accurate in size, and can meet the research demand on the horizontal plane of certain model of helicopters.