Based on a type of explosionproof enclosure,the sealing structure design of the explosionproof enclosure for hydrostatic test was studied.The whole structure of the explosionproof enclosure was introduced,the sealing structure design was investigated,including the sealing structure design of the bolted door flange,fastopen flange and button hole,and the choice of water inlet and air port and their sealing structure design.Through the field test,it is proved that the structure design is correct and simple.