The invention relates to an integrated reversible fuel cell system which comprises a hydrogen production power generation module formed by a fuel cell stack, a hydrogen circulation module, an oxygen circulation module and a water circulation module. The fuel cell stack is composed of a plurality of single cells which are stacked sequentially, a hydrogen inlet, a hydrogen outlet, an oxygen inlet, an oxygen outlet, a cooling fluid inlet and a cooling fluid outlet; each single cell is composed of a conductive plate and a membrane electrode; the hydrogen circulation module is connected with the hydrogen inlet and outlet of the fuel cell stack; the oxygen circulation module is connected with the oxygen inlet and outlet of the fuel cell stack; the water circulation module is connected with the cooling fluid inlet and outlet of the fuel cell stack; and in the system, power generation by the fuel cells is carried out in a forward process, and hydrogen production by electrolyzed water is carried out in a reverse process. Compared with the prior art, the integrated reversible fuel cell system has the advantages of being simple and compact in structure, lowering the cost, recycling water, hydrogen and oxygen raw materials, and integrated in management such as gas-water separation, and the like.