Fuel cell double-stack hydrogen integration system

The invention discloses a fuel cell double-stack hydrogen integration system, an ejector pipeline and a stack inlet manifold. The fuel cell double-stack hydrogen integration system comprises an upper-layer stack and a lower-layer stack, the ejector pipeline is arranged in the middle of the upper-layer electric pile and the lower-layer electric pile, and the upper-pile hydrogen inlet pipeline, the upper-pile hydrogen outlet pipeline, the lower-pile hydrogen inlet pipeline and the lower-pile hydrogen outlet pipeline are symmetrically distributed, so that the pressure drop difference between an upper-layer electric pile manifold and a lower-layer electric pile manifold is reduced, and the distribution uniformity of hydrogen and liquid water is improved; the interface I of the upper-layer electric pile manifold and the interface II of the lower-layer electric pile manifold are positioned on the same horizontal plane, so that the flow rates of hydrogen entering from the interface I and the interface II are the sam