The present invention relates to a cover for a battery having a dual sealing structure, and more particularly, to a cover for a battery having a dual sealing structure in which an inclination of a battery is increased so as to prevent the loss of an electrolyte caused by leakage according to the inclination of the battery, and a space for receiving the electrolyte leaking through the cover is expanded so as to enable a reduction of the amount of electrolyte discharged to the outside. The battery cover having a dual sealing structure, which seals a battery body for receiving an electrolyte and the upper surface of the battery body, comprises: a lower cover comprising at least one cell having an inflow hole which is open so as to communicate with a lower portion of the battery body, thereby injecting the electrolyte therethrough; and an upper cover coupled to an upper portion of the lower cover and having exhaust holes, for exhausting the electrolyte and gases to the outside, defined at each end thereof. In the lower cover, an exhaust cell, which comprises the exhaust outlet for guiding the leaking electrolyte and gases to the exhaust holes, is provided inward from the outermost cell which is provided on the outermost side.