Deep-water battery box

The invention discloses a deep-water battery box which comprises a box body and a battery pack arranged in the box body, wherein a cover plate used for sealing the box body is arranged on the box body; a pressure balancing member used for balancing inside and outside differential pressure and pressure compensation oil are arranged in the box body; the pressure balancing member is a membrane and arranged between the cover plate and the box body; and the box body is filled with the pressure compensation oil. The deep-water battery box has the advantages that the deep-water battery box is safe, effective, long in service life and simple in structure.