The invention discloses a novel lead acid storage battery case. The novel lead acid storage battery case is formed through injection molding of an acid resistant plastic, and is characterized in that steel plates are embedded into the side surface of the battery case paralleling to the plane of a pole plate in a pole group assembled in the case, all the steel plates are wrapped in the plastic, and the thickness of the steel plates is 2-4mm. The steel plates are embedded in the battery case, so the deformation of the battery case in high temperature environment or under a high internal pressure is substantially reduced, thereby the performances of a lead acid storage battery adopting the battery case are still stable at a high temperature under a high internal pressure.