The utility model provides a seal structure that can open automatically, seal structure includes closing plate and elastic element, wherein, the closing plate is provided with the through -hole, is provided with filter unit on the through -hole, elastic element takes place to deform when the temperature is greater than the default, to will thereby the effort is applyed to the closing plate the closing plate is opened. Compared with the prior art, the utility model discloses a seal structure can make the hydrogen recombiner during containment memory deposit is used, keeps encapsulated situation, and under accident situation, seal structure opens, makes the automatic beneficial effect who puts into operation into operation of hydrogen recombiner.