An electrode separator structure includes a conductive gas-resistant plate and a conductive porous structure. The conductive gas-resistant plate has a receiving space and at least a set of an inlet port and an outlet port, wherein the inlet port and the outlet port have passages communicating the receiving space. The conductive porous structure is disposed in the receiving space and communicates with the set of the inlet port and the outlet port to form reaction gas flow paths, wherein the conductive porous structure includes plural holes laminated as at least two porous layers, and the at least two porous layers are laminated in a staggered arrangement along a direction vertical to an extending plane of the conductive porous structure.