The invention discloses a battery explosion-proof device, belonging to the battery field. The battery explosion-proof device comprises an explosion-proof cover, wherein the explosion-proof cover is hollow and is made of conducting materials; and an explosion-proof valve is arranged below the explosion-proof cover and is hollow, a fusing block is arranged in the explosion-proof valve and supports the upper top surface of the explosion-proof valve, and the upper top surface is in contact with the lower surface of the explosion-proof cover and can elastically deform. The battery explosion-proof device has the characteristics that the safety performance of a secondary battery used by a new energy automobile can be further improved, the explosion and spontaneous combustion probabilities of the battery can be reduced, and meanwhile, the damage caused by the explosion and spontaneous combustion of the battery can be reduced.