The invention discloses a structure for effectively fixing a fuel cell unit. The structure comprises the fuel cell unit, a lower supporting plate and an upper supporting plate, wherein the lower supporting plate and the upper supporting plate are used for fixing the fuel cell unit. Grooves A for placing the fuel cell unit are formed in the lower supporting plate and the upper supporting plate, a storage slot for surrounding the fuel cell unit inside is connected onto the lower supporting plate, a buffer plate is arranged between the storage slot and the fuel cell unit and comprises a pressure dispersion plate and a wavy elastic buffer plate positioned on the pressure dispersion plate, the buffer plate contacts with the side face of the fuel cell unit, a plurality of small through holes are formed in the buffer plate, a groove B for clamping the buffer plate is formed in the upper supporting plate, a connecting plate is connected onto the upper supporting plate, the storage slot internally sleeves the connecting plate, and the fuel cell unit and the buffer plate are positioned on the grooves A and the groove B when the storage slot internally sleeves the connecting plate.